How Presidential vote understimates Dem Voting Strength

An interesting study. Bumped--Chris

I loathe when I hear Democrats dismiss candidate's chances in a  district citing the Cook PVI (Partisan Voting Index).  The Cook PVI systematically and severely understimates base Democratic performane in rural areas. For too long, the blogosphere has been beholden to the bias created as an artifact of the manner in which the Cook Report operationalizes partisanship. First let's take a look at how the Cook PVI is constructed.

The index for each congressional district is derived by averaging the presidential election results in that district from the prior two elections, then comparing them to how the nation voted as a whole. The index indicates the more successful political party and how many percentage points higher than the national average for that party. It is published as a Letter+Number combination.

So the basis by which the Cook PVI determines partisanship for Congressional races is by using Presidential vote.  The results of this are highly detrimental Democrats running in rural areas, because it makes what is often an entirely winnable district look impossible.  Let's look at how Ohio looks if you use presidential vote as a measure of partisanship.

2004 Ohio Presidential Vote by County

On this map shading indicates party vote share.  The deeper the blue, the higher the Democratic vote share.  The deeper the red the higher the Republican vote share.  The deepest blue indicate a Democratic vote share over 60%, medium blue 55-60%,  light blue 50-55%, light red 45-50%, medium red 40-45%, deep red less than 40%.

If we use the presidential vote as a proxy for base partisanship, our chances at holding onto the OH-18 look very bleek, and even the OH-06, incoming Gov. Strickland's old seat looks sketchy.  And we may as well write off any future fights in the OH-02 and OH-15, clearly the red ring of death around Columbus is just to hostile to Democrats.  On Monday, Kos put up a post about pundits poopooing Democrat's chances to hold on to districts where George Bush won in 2004 but a Democrat took in 2006.  Here again is the bias created by using presidential vote as a measure of base partisanship.

Approaching the "funnel of causality" contributing to individual voter's choice theoretically we can present a(n extremely simple) presentation.


Vote Choice =   Base Partisanship  +    Information Effects
               (ie Cook PVI, etc)     (Candidate personality,  
                                      Campaign spending,
                                      Media Coverage, etc)

Presidential vote and measures constructed from it (ie the Cook PVI) show that there's this huge urban/rural ("Blue"/"Red") divide. Looking more deeply at the theoretical basis of partisanship, there's a simple reason why presidential vote is a poor measure of campaign effects.  If we want to measure the way that voters cast their vote in an information vaccuum, we need to remove the influence of information effects on vote choice.  Because the Presidential race is one where voters are much more highly informed of the issues and personalities than even Congressional races, any measure of base partisanship created from it if fundamentally flawed because it contains information effects that create bias.  And it severely overestimates the urban/rural divide.

When states redistrict, the people who draw the maps do not use the presidential vote as a measure of partisanship.  What they do use is the mean of state races.  In order to counter bias from information effects, preferably we need to find low profile races, i.e races where non-primary voters don't understand what the position does nor who the person running is.  For this reason, it's best not to use Governor's races, and Attorney General races preferably would not be included.  Ideally, what results would be the mean of 3-5 low profile statewide reaces. During redistricting, this is done at the precinct level, and districts are built from this using precincts like legos to make the district. I've created a
measure of base partisanship (I call it 3DMEAN for short) for Ohio using the 2006 results from the Auditor, Secretary of State, and Treasurer's races.  Using this measure, base Democratic partisanship statewide in Ohio is 54.1%.  I haven't attempted to run this historically, but as a rule because these races are most often less affected by  information effects partisan shifts should occur much more slowly than in highly informed races like for President. Below is what the state of Ohio looks like using the 3DMEAN measure I created.

2006 Ohio Base Democratic Vote (3DMEAN) by County.

On this map shading indicates base Democratic partisanship.  The deeper the blue, the higher the base Democratic partisanship.  The deeper the red the higher the base Republican partisanship.  The deepest blue indicate a base Democratic partisanship over 60%, medium blue 55-60%,  light blue 50-55%, light red 45-50%, medium red 40-45%, deep red less than 40%.

Overall, this measure shows Ohio to be far more Democratic than Presidential vote and the Cook PVI ,as a result, indicates.  Zack Space's probability of holding on to the OH-18 goes through the roof with all that blue around Zanesville, and the red ring of death around Columbus (Franklin County) turns light pink.  Franklin county itself turns deep, dark blue (60.7% Democratic), and the OH-15 looks to be in play. Turning to 2010 and redistricting, I see that Democrats can create 3-4 more Democratic districts. (I anticipate Ohio will lose a seat in the reapportionment.)

In the Columbus area the OH-15 can be extended from Columbus to Dayton, another district can be drawn south from Columbus to Scioto county and Portsmouth, and a rump district centered on Columbus and taking up some of the suburbs can be made.  I think that OH-14 near Cleveland can be redrawn to have a Democratic majority also.  

At this point I want to show you a map demonstrating the difference between using Presidential vote (like the Cook PVI) and a mean of low profile statewide races (like my 3DMEAN), and talk a little bit about the impact this has on the way we look at districts.


Ohio 2006 3DMEAN minus 2004 Presidential Vote by County

Statewide 2006 3DMEAN shows the base Democratic performance to be 5.4% higher than that given by the 2004 Presidential vote. The shading on this map shows the result of subtracting the 3DMEAN from the Presidential vote.  The deepest blue indicates that 3DMEAN is 10% or more than the presidential vote, medium blue 5-10% more, and light blue.

The most prominent difference betweent the two measure is the while 3DMEAN and Presidential vote converge in urban areas, it deviates strongly in rural areas downstate.  The largest expception to this is in the Columbus area, which leads me to believe while in its effect the use of Presidential vote as a  proxy for base partisanship is to overstate the urban/rural divide, at the heart of the matter is something else.  I think that there's a difference between the way that people from metro and non metro areas vote.  I think that people in rural areas in generl get their information about politics from friends and family, while in the cities there's a tendency to rely on the media to provide the clues that form the basis of partisanship.  And it's not just Ohio.  

Let's take a look at Indiana, where the effect is even more prominent.

2004 Indiana Presidential Vote by County

On this map shading indicates party vote share.  The deeper the blue, the higher the Democratic vote share.  The deeper the red the higher the Republican vote share.  The deepest blue indicate a Democratic vote share over 60%, medium blue 55-60%,  light blue 50-55%, light red 45-50%, medium red 40-45%, deep red less than 40%.

2006 Ohio Base Democratic Vote (3DMEAN) by County.

On this map shading indicates base Democratic partisanship.  The deeper the blue, the higher the base Democratic partisanship.  The deeper the red the higher the base Republican partisanship.  The deepest blue indicate a base Democratic partisanship over 60%, medium blue 55-60%,  light blue 50-55%, light red 45-50%, medium red 40-45%, deep red less than 40%.

Indiana 2006 3DMEAN minus 2004 Presidential Vote by County

Statewide 2006 3DMEAN shows the base Democratic performance to be 5.4% higher than that given by the 2004 Presidential vote. The shading on this map shows the result of subtracting the 3DMEAN from the Presidential vote.  The deepest blue indicates that 3DMEAN is 10% or more than the presidential vote, medium blue 5-10% more, and light blue.

Again, the urban/rural divide is overstated by Presidential vote.  Using Presidential vote Indiana is 39.3% Democratic.  Using 3DMEAN, calculated using results the Auditor, Secretary of State, and Treasurer races to create a mean, the state is 47% Democratic.  While many of those voting for Democrats in low profile state races (i.e 3DMEAN) will never vote for a Democrat for president, they have and will vote for Democrats if they present a populist economic message.

Looking at the IN-08, Presidential vote understimates Democratic strength by 23.3% in rural Sullivan county, and 13.3% in Knox County (Vincennes).  This is a heavily Democratic district when measured using low profile, state races as the basis of partisanship.  In the IN-09, Presidential vote understimates Democratic strength by 20.0% in Dubois County, and 16.8% in Harrison County in the Louisville suburbs.  This is why those who dismissed these districts as Democratic pickup opportunities because the IN-08 has a Cook PVI of R+9 and the IN-09 a PVI of R+7 were so wrong headed.  Looking north in the IN-02 (PVI R+4), the 2004 presidential vote and 2006 3DMEAN tell far different stories.

CTY           2004 PRES       2006 3DMEAN     Notes

Elkhart        29.3%             38.6%        IN-02 has city
                                              precincts

LaPorte        49.6%             55.9%        LaPorte
                                              16.4% of CD

St Joseph      48.5%             56.3%        South Bend    
                                              39.3% of CD

The IN-02 may be the quintesential swing district.  Populated heavily by working class European ethnic minorities who are Catholic.  It's an area that changes every time that the national political siutation realigns.  And Joe Donnelly is precisely the sort of Democrat that the people of the 2nd go for, the type that will stick the noses of the Wall Street wing of the party in the messes their neo-liberal policies create on trade and globalization issues.  And that brings up the finale and the lesson the difference between the two measures creates.

If we use Presidential vote as a basis of partisanship we buy into a story of two Americas one "Red", one "Blue" that are diametrically opposed.  If we accept this, as a consequence we abandon areas outside of the metro areas to Republicans, and we fashion our party platform towards the interests of voters in the suburbs, who are presumed to be more interested in Wall Street Populism that while creating economic growth creates grave inequalities.

If we accept that the results of low profile statewide races more accurately represent base Democratic strength, we fight out in the little towns and country where working Americans have seen the prosperity of earlier years shipped away with each factory.  And when they protest that they are the victims of injustice, the Wall Street Populists tell these folks it's their fault because they didn't get the right education.  That's why what Senator Kerry's statement prior to the election was so damning, it gave refuge to the pushers of the Great Education Myth. We've had it to many times, and we don't believe it anymore out in "Red" America.  I know that it's hard for a lot of people to understand, but many of the UAW workers who work in the factories being shipped out have college degress.  In some factories, it's near half of the factory that have a college degree.  And it's not only the guys on the line.  It's the engineers being forced to train their replacements from India.  If you live in the cities where the economy is based on the skilled service sector, you haven't seen the full economic armageddeon being unleashed by unrestrained free trade and other neo-liberal economic policies. Just wait, first they came for us, your time will come.

If we want to win those Democrats who aren't showing up in the Presidential vote totals, we have to embrace the message of Main Street Populism represented by people like Senator Sherrod Brown and Rep. Joe Donnelly.  And we need to have the sense to realize that 2006 wasn't a fluke, there are many districts like the IN-06, my home, if only we put in the time and money to make a stand.  If we accept the idea that Presidential vote is a proxy for base Democratic vote we sell ourselves short, and are pushed into a platform that sells out working people who've been the victims of neo-liberal economics.



Display:


Re: How Presidential vote understimates Dem Voting (none / 0)

Ohio is surely going blue.


by Shank on Wed Dec 20, 2006 at 08:57:50 PM EST

Re: How Presidential vote understimates Dem Voting (none / 0)

We have to get to the basis of the divergence between base voting for low profile statewide races and the presidential race.  We're never going to bridge the entire gap, but if we can get candidates with the right message we can close most of it.  

More importantly is what's happening in Congressional races.  In many areas Congressional candidates are losing Democrats.


by ManfromMiddletown on Wed Dec 20, 2006 at 09:34:23 PM EST
[ Parent ]

Charlie Cook responds (3.00 / 2)

Every few months I am tempted to remove our Cook Political Report ratings and our Partisan Voting Index (PVI) from the public portion of our cookpolitical.com web site, it gets tiresome to respond to people who don't understand what it is,what it is intended to do, how professionals use it and how it fits into the way that our five-person staff analyzes races.  Is it worth it?

By way of explanation, The Cook Political Report and cookpolitical.com is prepared for and used by professionals, government relations, public affairs and political professionals, as it has since founded in 1984, whether they are corporate, labor union, trade or professional association of any other interest group.  Their lobbyists and PAC directors use it, along with a couple of other comparable publications/sites, it aid in their own analyses of races and to help make campaign spending allocation decisions.  These groups range from the left to the right, from environmental, pro-arms control and anti-gun groups on the left to their opposites on the right and everything in between.

When they subscribe to The Cook Political Report, they get rather exhaustive narative analyses of the top Senate, House and gubernatorial races, based on interviews with the candidates in most competitive races, their managers and consultants, sources and journalists in the states/districts, watching the ads and local news coverage and based on our own experience, with over 80 years of political experience between myself and our Senate and House experts.

We invented the Partisan Voting Index in order to have a single-objective measurement of how a district votes in presidential elections compared to the rest of the country.  One single number to look at, based on the average two-party vote in the last two presidential elections.  It is the start of our analytical process, not the middle and certainly not the end.  It's a short-hand way to look at a district at the outset of analyzing it.  We then look at hundreds of other factors, including face-to-face meetings, conversations with camapign consultants, many, many other factors.  If our analysis process could be put on an A-Z scale, looking at the PVI is A, looking at the districts with comparable ratings and seeing the party split among those is B, then we move on to many, many other factors.  Anyone who began and ended their analysis with the PVI would be a fool.

But it is a very useful tool.  If a district has a PVI of R+6 (meaning that the district voted six percentage points more Republican than the country as a whole did), and you look at the other districts that are rated R+6, and for that matter, R+5 and R+7, and see how many (or few)Democrats occupy districts with comparable voting patterns, that is a tipoff that something has to be pretty darn unusual (scandal, tidal wave election) for that district to turn from Republican to Democratic.  But then, you begin examaining and looking for any of those special circumstances that might create that exception.

I thought it interesting and amusing that many, for that matter, many Democrats and liberals, in fact many who periodically post on MyDD and on Daily Kos, were very slow to pick up on the strong pro-Democratic wave in 2006, because for many, their political experiences and expectations were formed in the 1996-2004 period of elections, five election years in which the Tip O'Neill adage of "all politics is local" certainly fit.  But those of us who had witnessed contemporaneously the 1994, 1982, 1980 and 1974 elections, when all politics was anything but local, could see that something very different was happening.

Anyone taking 2006 election results and expecting that to be a good starting point or reference point for 2008, or 2010 would be just as wrong, or more accurately, it would be like someone who expected the Newt Gingrich led tidal wave election to be replicated by similar tidal waves in 1996 and 1998, which obviously didn't happen.

Can Democrats overperform, or underperform their PVI?  Sure.  So can Republicans.  But presidential voting is the only single measurement that can be used across all 50 states and all 435 congressional districts because it is the only kind of race where the same candidates are on the same ballot on the same day.  Use it, but don't expect it to perform miracles.

And don't assume that when you see a Cook Political Report race rating or PVI, you are seeing the totality of what we do and what we are saying about a race and how we reached those conclusions.  99 percent of our content is behind the curtain for our paid subscribers.

There are no magic formulas in this business.  You can start with quantitative data, election results and census data, and later on polling data, but that is where the science ends and the art begins.  It is analysis based on a multitude of other information, and experience having done this for years.  It doesn't mean that we get everything exactly right, no one can do that.  But we come pretty close.

During the first week of August I began writing in my columns that if the election were held then, the House would turn Democratic, or to say it differently, that we were on a trajectory toward Democrats winning the House, and something would have to happen to change that trajectory.  We also said then that the Senate was becoming an increasingly close call, and was nearing the point of being a 50-50 proposition.  That was three months before the election.

Our final projections were a GOP loss of 20-35 in the House (the midpoint was 27.5, the final was 30), four to six in the Senate (final six) and 6-8 in the governorships (final eight).

The PVI didn't make those projections, but we did with a process that started, but didn't end with the PVI.  


by Charlie Cook on Thu Dec 21, 2006 at 09:59:55 AM EST
[ Parent ]

Re: Charlie Cook responds (none / 0)

I wonder if a comparison of the the PVI vs. the 3DMEAN analysis would yield a measure of the "effectivness" of a given Presidential campaign by a given candidate?


by Sam I Am on Thu Dec 21, 2006 at 11:10:49 AM EST
[ Parent ]

Re: Charlie Cook responds (3.00 / 0)

Anyone who began and ended their analysis with the PVI would be a fool.

I think that was ManfromMiddletown's point. That was exactly what a lot of people were ignorantly doing (e.g. writing off challengers and certain districts strictly because of their perceived GOP leanings based almost exclusively on the PVI).


by adamterando on Thu Dec 21, 2006 at 12:15:14 PM EST
[ Parent ]

Re: Charlie Cook responds (none / 0)

That would be the point.

Which is perhaps less an indictment of Mr. Cook, than the way in which it has been used by people in the blogosphere.  This summer there where people writing about the lack of wisdom in pouring money into the IN-08 because Kerry lost there by a large margin.  

Still, I think that Presidential vote is poor proxy for base Democratic vote in Congressional races. In order for me to believe that Presidential vote captures base partisanship better than a mean of low profile race, I would have to believe that people know less about who is running for president than for state auditor.  That just doesn't make sense if what we are trying to capture is the effect of party on voting in an information vaccuum.

Even more so that Mr. Cook's PVI measure I was targetting the people who are using 2004 returns for Kerry as a measure of base performance in places like the IN-08.  I believe that using a presidential measure overstates the urban/rural, blue/red gap.  It unneccesarily divides us.

Of course, I also think that gathering the level of information I'm talking about down to the precinct level (which you need to have for redistricting, and even then can be muddled if counties were forced to reprecinct) would be extremely expensive.  This is why the Democratic party is fortunate to have the services of the NCEC which donates even more highly detailed statistics to candidates for use in campaign planning.

When looking at different districts, the only measure we can speak of with certainty is the previous cycle's returns for that Congressional race.  Other things like demographics feed into the party id, but in the long term the effect of these other factors on party if absent some sort of exogenous shock to the system (i.e. scandal, war, recession, etc) is slow moving.  


by ManfromMiddletown on Thu Dec 21, 2006 at 03:42:07 PM EST
[ Parent ]

Re: Charlie Cook responds (none / 0)

ManfromMiddleton makes my point precisely.  No lower level races cross state lines.  For a party to make targeting decisions, you have to start off with something that is universal, something that allows the comparison of all races in all 50-states.  Using a gubernatorial, Attorney General, state Auditor or university Board of Regents may allow the comparision of one county in a state to another, or one congressional district to another, but does not allow any meaningful analysis across state lines.  As I said, this is the beginning not end of the process.

But as I pointed out elsewhere, using one year's statewide election results, a year that in no way resembles any other for three decades or so, is a horrible way to analyze a situation.  This was a year when it was almost a crime to be a Republican candidate in Ohio.  Judging the partisan voting patterns in a state under these circumstances, and trying to extropolate into the future, is crazy.  Using two presidential elections that were both quite competitive nationally, and comparing each district with one another, using two elections, not just one, works much better than one highly unusual election year.

Using your 3DMEAN methodology, but utilizing 2002 election data rather than 2006, one would conclude that it was probably futile for Democrats to run anybody for anything short of Cleveland.  After all, in 2006 Republicans won all three races that you use to calculate it, Auditor, Secretary of State and Attorney General, in fact I don't remember any of those races even being close.


by Charlie Cook on Thu Dec 21, 2006 at 04:28:43 PM EST
[ Parent ]

Cook (none / 0)

Let's get this straight.  Republicans win the Ohio governorship in four consecutive elections (1990, 1994, 1998 and 2002).  Republicans going into the 2006 election with every single statewide office, last time I heard, even every supreme court justice but that might have changed.  But something like all 12 statewide offices.  

Then we have a bottom-falling out, heavily Democratic election in 2006, and this guy builds a model analyzing party strength by county for the state using just 2006 returns, and says that the state preforms almost 55 percent Democratic, ignoring the simple fact that it was an extraordinary election, weird circumstances (governor pleading guilty, massive state scandals) and wants to extrapolate out from just 2006 elections.

Wow.  I am going to watch anything this guy writes from here on out very, very carefully.  I'd fire any employee of mine that used that faulty analsis.


by Charlie Cook on Thu Dec 21, 2006 at 12:37:09 PM EST
[ Parent ]

Re: Cook (none / 0)

Republicans win the Ohio governorship in four consecutive elections (1990, 1994, 1998 and 2002).  Republicans going into the 2006 election with every single statewide office, last time I heard, even every supreme court justice but that might have changed.  But something like all 12 statewide offices.

True this needs to be done over multiple election cycles, but I don't think the general idea is a bad one. The diarist isn't getting paid thousands of dollars (or millions, whatever) to do this. If he was, I'm sure he'd include multiple years in the anlaysis.

But on a deeper level, I think we need to attach some kind of confidence intervals to whatever partisan numbers you attach to an area. This would be very hard to do quantitatively.

For example, it is true that the GOP controlled Ohio from top down from 1994-2006. But this was a time when the Ohio Democratic party was in a shambles. Couldn't this election be a harbinger of what the partisan make-up of offices will be for the next decade or so? Especially given the voting preferences of young voters exhibited in the last 2 election cycles.

Look at Illinois. The GOP controlled the governors mansion for 25 years. But the partisan nature of the state has slowly changed to a solid Democratic voting block. Now Democrats control every statewide office and both houses of the legislature. So my question is, which measure as an initial starting point would have captured and/or predicted this turn better: the PVI or a moving average measure of partisan voting strength in low-profile state-wide races? Would the PVI have predicted Mellissa Bean's triumph in 2004 or would have manfrommiddletown's? Or neither ?

The fact that something similar to what the diarist is proposing is actually what IS used by state legislatures to redistrict should say something about its usefullness.


by adamterando on Thu Dec 21, 2006 at 04:15:02 PM EST
[ Parent ]

Re: How Presidential vote understimates Dem Voting (3.00 / 1)

Good points, but a stronger case could be made by looking at an average of two or three elections.  Since, particularly in OH and IN, 2006 was a much better year than most.  Remember that the GOP controlled all of OH's state-wide offices going into this past election.


by Ramo on Wed Dec 20, 2006 at 09:39:34 PM EST

Re: How Presidential vote understimates Dem Voting (3.00 / 1)

Agreed.

I think that the best thing would be to try to get figures for 2002, 2004, and this year,  That way we can get a trajectory also.  That can be a lot of work depending on the shape the data is in.

My plan was to finish the Graphic Anatomy of Victory series, and then go down to the precinct level in close races.

I jusr want to up the level of analysis for races, so we base assertions in numbers not notions.


by ManfromMiddletown on Wed Dec 20, 2006 at 09:58:17 PM EST
[ Parent ]

Cook Again (none / 0)

That's why our PVI is calculated using the two most recent presidential elections.  Going back any farther than that is not as useful because over a decade or more, the nature of districts change, becoming more urban, more suburban, more or less Democratic, what have you.  

Admittedly this is a crude instrument, we created it and are the first to admit that.  We would never recomend that anyone depend solely on it.  But it is the best there is.


by Charlie Cook on Thu Dec 21, 2006 at 12:17:06 PM EST
[ Parent ]

Re: How Presidential vote understimates Dem Voting (none / 0)

This is very interesting.  But I have a question - Both states you showed were biased against Dems in the PVI index.  Is this the case in ALL states?  Or is there a group of states or a region where the bias goes the other way?

Also, I am wondering to what extent your result is an artifact of the last two races we have had.  Would including the last 4 races (2 rep wins and 2 dem wins) give a PVI that was more reasonable?


by sck5 on Wed Dec 20, 2006 at 09:58:40 PM EST

Re: How Presidential vote understimates Dem Voting (3.00 / 1)

This is very interesting.  But I have a question - Both states you showed were biased against Dems in the PVI index.  Is this the case in ALL states?  Or is there a group of states or a region where the bias goes the other way?

I don't know, but I imagine that in highly Democratic states in presidential races, the opposite would be true.

The jumping off point came from when I worked at the Indiana House during redistricting.  This was during 2001, and the guy drawing up the maps used a slightly modified set of state races.  I think he used 2000 Gov, SOS, and Attorney General.  

My theoretical approach is that in low profile races information is low, so most voters really don't know who the candidate are or what the position does, so they voted according to something they do know, party.  Most voters are rationally ignorant.

Marketers can take advantage of rational ignorance by increasing the complexity of a decision. If the difference in value between a quality product and a poor product is less than the cost to perform the research necessary to differentiate between them, then it is more rational for a consumer to just take his chances on whichever of the two is more convenient and available. Thus, it is in the interest of the producer of a lower value product to proliferate features, options, and package combinations until the average shopper finds it too much trouble to make an informed decision.

This also works for politics. By increasing the number of issues that a person needs to consider in order to make a rational decision between candidates, they can level the playing field by encouraging single-issue voting, party-line voting, and other habits that tend to ignore a candidate's actual qualifications for the job.

Another, more nuanced, political application involves a voter's identification with a political party, much like the adoption of a favorite movie critic. Based on prior experience a reasonably responsible voter will find politicians or a political party that will draw conclusions similar to their own conclusions when the voter had the time to do the analysis. This is just like the way we adopt a movie critic that likes movies that we like. In this way we let the political party, the politician, or the movie critic do the "heavy lifting" for us as we spend our time doing our job, raising our family or just lying on the beach.

The United States is very different from most countries in the number of races we vote for at one time.  In other countries voters cast ballot far fewer races at one time.  Like maybe 10 races maximum at one time.  Here in the US, we often have President, US House, US Senate, Governor's, State House, State Senate, County Council, County Commission, Sherriff, loads of ballot measures, etc.

Eventually most voters who are really interested in the process say to themselves "F**k if I know" and ether cast no vote (a 5% falloff is typical in Indiana and Ohio) or rely on party as a cue to whether the candidate thinks the way that they do.


by ManfromMiddletown on Wed Dec 20, 2006 at 10:32:34 PM EST
[ Parent ]

Jackman's Partisan Index (3.00 / 1)

Simon Jackman of Stnaford, who posts occasionally at pollster.com, has done a much more thorough study than Cook of how to measure a district's partisan index.  You can find the methodology paper and the district-by-district data on his web page.  It does not specifically speak to the claim here that Cook underestimates D's, but it is a very interesting read.

I strongly suggest a methodology like this start to be our basis for choosing vulnerable districts, and for a posteriori analysis of how we've done in districts.  It's much more sophisticated than analyzing the Kerry vote in a district.


by Professor Foland on Wed Dec 20, 2006 at 10:53:48 PM EST

National vs. State partisanship (none / 0)

The reason for the gap between Cook and state results is fairly straightforward. Cook is looking at national party identification, for which the presidential results are an excellent proxy - since candidates have to run nationwide. State election results measure the partisan and ideological predisposition of the voters at the state level.

So if you look at national results, you wonder why the Republicans ever win any seats in upstate New York. But the New York Republican Party is far more liberal than the national Republican party, so they "overperform." The same is true for Indiana Democrats.

The tension in these races is the degree to which state or national partisanship is the driving force in a given election. In 2006 Democrats benefited from the pro-Democratic tilt. That tilt might not be there in 2008, in which case a nationalized election could lead to some losses by Democrats in conservative districts (like Baron  Hill in Indiana, for example).


by thirdestate on Wed Dec 20, 2006 at 10:57:54 PM EST

Re: Cook Again National vs. State partisanship (3.00 / 1)

The PVI doesn't look at party identification, it looks at voting in the last two presidential elections, which tends to correlate very highly with congressional vote in competitive elections.  Obviously when a district is uncontested, or undercontested, with a warm body but not a serious candidate, there is a large differential.  When it is a competitive race, it runs reasonably close.

I emphasize that the PVI is not a predictor.  Only a fool would think it is.  But it is a logical first step of analysis of a district.


by Charlie Cook on Thu Dec 21, 2006 at 12:20:51 PM EST
[ Parent ]

Re: Cook Again National vs. State partisanship (none / 0)

The PVI doesn't look at party identification

That is how it is being used by bloggers, which is my main objection.  PVI tells us very little about whether a person is fundamentally a Republican or a Democrat.  

which tends to correlate very highly with congressional vote in competitive elections.

So this assumes that voters highly informed about all races.  By approaching partisanship from the basis of highly informed voter I think we learn very little about partisanship.  And I think partisanship is the basis from which candidates must work to determine how to win.  And from which parties and donors must looks to see where resources are best spent.  

This year saw the 50 State Strategy, in which dozens of Congressional seats flipped.  Many of them in areas that have not been considered competitive.  

I emphasize that the PVI is not a predictor.  Only a fool would think it is.  But it is a logical first step of analysis of a district.

I think that the logical first step in analyzing a district is to look at what is (i.e. results from the previous election cycle), and then to use other measures to see what might be.  Looking to 2008, the presidential races on which the PVI is based indicate a far more Republican nation than the results of the 2006 election.

I think that what happened this year was a shift of voters who are fundamentally Democrats back to the Democratic party.  Also, PVI as a measure of the partisan strength of district, tells us nothing about what elections are like when turnout drops for midterms.

Bottom line, what I tried to do was show the difference between looking at 2008 from the approach I'm using, compared to one that uses Presidential vote from 2004 (and I don't think that including 2000 numbers changes much.)  It's a start not an end. They lead to different places.

The first step is to recognize what is, there are a set of 15-30 races that were very close this year, and that has to be where we start looking for 2008.  But beyond that,  I think that PVI tells us very little about how districts that will be open seats in 2008 will fare.  And I think that after the scare many of them recieved in this cycle many Congressional Republicans are going to retire.

I'd write more, but have to go.

Have a merry Christmas, Mr. Cook.


by ManfromMiddletown on Thu Dec 21, 2006 at 04:23:48 PM EST
[ Parent ]

Re: How Presidential vote understimates Dem Voting (none / 0)

When you compare the Bush image to Kerry's image, it's not a surprise that Bush would do a better job of peeling Democratic rural voters away from John Kerry than he would urban voters.  (Bush, of course, is an east coast elite, but he does a good job covering it up.) As you said, studying data from other elections will help remove individualized variable effects.  But 3DMean is clearly superior to PVI.  You had already convinced me of this in your prior state-by-state analyis of the Congressional elections.

You're posts are great.  Keep up the good work!


John McCain will privatize social security.
by gunnar on Wed Dec 20, 2006 at 11:01:30 PM EST

Re: How Presidential vote understimates Dem Voting (3.00 / 1)

Now if i could just get my hands on the 3DMean on a district by district basis ;-)


by DanD on Thu Dec 21, 2006 at 12:22:38 AM EST

Re: How Presidential vote understimates Dem Voting (none / 0)

Maybe.

That's a long term plan of mine.

It's a time and money issue.

First, I'm going to finish this Graphic Anatomy series which will show them at the county level.


by ManfromMiddletown on Thu Dec 21, 2006 at 12:31:54 AM EST
[ Parent ]

Re: How Presidential vote understimates Dem Voting (none / 0)

Do you have access to some GIS software? It might make the mapping go faster.

Great series and thanks for this diary.


by adamterando on Thu Dec 21, 2006 at 09:53:22 AM EST
[ Parent ]

I know it's in the interest of scholarly language (none / 0)

...but please please PLEASE stop staying "light red 45-50%, medium red 40-45%, deep red less than 40%" in Dem performance.

It's much more comprehensible to me to say "light red is republican 50-55%, medium red 55-60%, and deep red more than 60%."


by MNPundit on Thu Dec 21, 2006 at 01:59:48 AM EST

My thoughts (none / 0)

While this is an interesting post I can't evaluate your claim that Cook underestimates rural performance.  Furthermore it seems like even if the deep blue 06-04 (where Cook underestimates) lines up with the rural sections of OH and IN that doesn't mean that the same will be true in all other states.  By only using Kerry in 04 you bring in a whole slew of variables into play, personal dislike for Kerry among certain demographic categories as well as RINO and DINO voting, which is influenced by the amount of information recieved by the voter.  If you used up ballot races over three cycles and compared it to down ballot you could isolate DINO and RINO voting trends, and then compare local to national democrats with that isolated to see where national democrats significantly underpreform local dems while accounting for RINO and DINO.  RINO and DINO being people whose issue position don't match their partisan self identification. When this occurs they vote for the issue positions up ballot and then the self identification down ballot. This could account for some of the movement int he 06-04 map, where in certain parts people who idetified as one party voted against their identification in 04 prez but with their identification in 06 statewide.  These sorts of voters aren't alwasy evenly distributed and hence can account for some of the variation in the 06-04 map.


by descartes on Thu Dec 21, 2006 at 03:22:32 AM EST

You can't use Ohio 2006 as representative (3.00 / 1)

I would throw it out completely. Seriously, how can anyone assert base Democratic partisanship is 54.1% when we haven't owned a major statewide office in many cycles? You might as well use the Bears/Dolphins result as indicative of the levels of those two teams.

This year the perfect political storm nationally and statewide created Ohio for Democrats but there is no demographic shift like Northern Virginia or sections of Colorado. A better evaluation of Ohio would be to ignore 2006 and assign numbers based on 2000, 2002 and 2004. That would probably understate blue strength somewhat, but isolating 2006 alone is bizarre in the opposite extreme.

I've tinkered with PVI for a decade and I agree it's imperfect in regard to congressional races. The primary value is forecasting presidential statewide results and also a tool for heavily contested senate races. Recent PVI is very good since it deals with two presidential races bordering 50/50, the 2000 and 2004 races. When I began studying the numbers in '96 you had the Perot influence, and several previous lopsided results in favor of the GOP nominee. Even 2000 is imperfect because of the Nader influence in several pro-Democratic states. Assuming Bloomberg won't screw up 2008, a post-election presidential PVI focusing on 2004 and 2008 should be the most accurate in recent history.

I don't completely concur with ManfromMiddletown's oft-posted belief that lower statewide races are indicative of party strength. Check out Nevada 2006 in that regard. We swept the four lowest statewide races, everything below lieutenant governor. Many of them by considerable margin, including secretary of state. Using the 3DMEAN criteria you would identify Nevada as a blue state and dramatically different than 2002, when Republicans handily won all six statewide races.

And that analysis would be utter nonsense. This is a red state and many indications are it is tilting more in that direction. Every local analyst is saying things along those lines. Self-identified conservatives jumped to 36% this year, highest I've ever seen in this state.

We won the lower statewide races via very basic reasons -- superior candidates and more money. Years ago I tried to make a case for the lower statewide races instead of presidential PVI but I noticed that trend far too often, that when races are not heavily prioritized or contested by both sides there is far too much potential for an outstanding up and coming candidate to win handily and severely tilt the partisan impression.

The secretary of state race in Nevada was an excellent example this year. Ross Miller is former two-term governor Bob Miller's son. He was a terrific candidate and well financed, including high profile commercials cut by John Walsh of America's Most Wanted fame. Ross Miller defeated Danny Tarkanian by 9 points. There is nothing in that result that tells you anything about Nevada statewide voting tendencies, nor the three congressional districts. Not unless you want to severely kid yourself leading to 2008 and beyond.


by Gary Kilbride on Thu Dec 21, 2006 at 03:25:18 AM EST

Re: You can't use Ohio 2006 as representative (none / 0)

of 233 Democratic Memembers of Congress 9, count them 9 came from districts where George Bush got 60% or more. I am not saying give up, but polarization is clearly  in existence. Indiania  is an interesting exception, which needs to be looked at, also, the Gore-Kerry might be a phase Whereas I think Clinton did better in all three of the districts dems picked up.


by Democraticavenger on Thu Dec 21, 2006 at 07:02:49 AM EST
[ Parent ]

Re: You can't use Ohio 2006 as representative (3.00 / 0)

I think you're right. The thing that pisses me off about the PVI is that it is a false measure to some degree. Even all the way here in Australia I can tell you what a completely crap candidate you had in Kerry. The deep red states of Kentucky and Tennessee were carried by Clinton twice, both have Dem lower houses and Kentucky will soon have a Dem governor again.

A PVI means much more in a Westminster system where the candidate is chosen by members of the party (a hundred or so people for each district make the decision). No such things as Dem registered voters for instance. As a voter you have no idea what the personal  views or philosophy of your candidate are. You know the party platform and little else. If the elected candidate doesn't tow the party line once elected they are usually expelled from the party.

The thing I admire about the last Dem round of candidates is that most of them really suited their District. PVI means nothing when you have Kent Conrad as your senator or Brad Ellsworth as your Congressman. It showed just how big the tent is.

If one is is discuss pure partisanship then all local, state and federal races need to be taken into account. A lot of states are less red than you think and this is why Dems win ....


by bluemogwai on Thu Dec 21, 2006 at 07:39:51 AM EST
[ Parent ]

Re: You can't use Ohio 2006 as representative (3.00 / 2)

Ideally, instead of using a mix of three downballot statewide races, you'd choose one statewide race as an accurate indicator of base partisanship, using the specific characteristics of that race as the reason for choosing it.

So, if studying Nevada, you'd toss out SecState, cause that race obviously had significant candidate effects.  There is almost always one race, however, that has either two typical and evenly matched candidates, or two completely and utterly unknown candidates.  Either will work as an accurate indicator of raw partisanship.

For instance, in California in 2006, the governor race (Schwarzenegger v Angelides) is a terrible indicator.  The Lite Gov race (McClintock v Garamendi) is still no good.  The Insurance Commissioner (someone v Bustamante) is awful.  And Attorney General (Jerry Brown v Poochigian) and Treasurer (Lockyer v somenobody) aren't fair either.  But controller (nobody v nobody) is fair, and is what a lot of people used to measure base partisan turnout.  In Texas, John Sharp v David Dewhurst 2002 is considered the indicator election.  And it might even be the case that in Nevada, governor was the most solidly and evenly contested race and therefore the best indicator.  But usually there is some good election to use, and it's usually not the presidential.   And ideally it's not an average of three random downballot tickets either, but if you can't spare the extra research to figure out the right election to use, it's a pretty decent approximation.


by texas dem on Thu Dec 21, 2006 at 07:32:34 AM EST
[ Parent ]

Re: You can't use Ohio 2006 as representative (none / 0)

Seriously, how can anyone assert base Democratic partisanship is 54.1% when we haven't owned a major statewide office in many cycles?

Well there are more registered Democrats than republicans in Ohio aren't there?

And as far as not winning a state-wide election for a long time, doesn't that speak to manformiddletown's point that you need run canidates that are appealing to rural as well as urban areas so that the oft-times favorable base-partisanship in rural areas will extend to the up-ballot races as well as the down-ballot races?

Also, the Democrats' share of the presidential vote has been increasing in Nevada now for the last two decades hasn't it? As union strength continues to incease in Las Vegas wouldn't you expect the republicans support to continue to erode away? We're one seat away from taking over the senate now aren't we?


by adamterando on Thu Dec 21, 2006 at 10:15:19 AM EST
[ Parent ]

Re: Cook You can't use Ohio 2006 as representative (3.00 / 1)

Gary is absolutely correct.  I wouldn't use 2006 (or 1994) as a benchmark for anything other than, I a specific Democratic candidate performed in an election with hurricane force winds at his/her back.  Anyone thinking that this will be replicated in 2008 --- well I would just suggest that they have not been watching politics very closely.  

The last time Democrats enjoyed a comparable political climate to 2006 was in 1974, the last time before that was 1964, the time before that was 1958.  1982 wasn't like this.  Four times in a half century, only once in last 30 years.

For Republicans, the last time was 1994, before that 1980, before that 1966.

Basing any exhaustive analysis of voting patterns solely using 2006 is an inherently flawed approach.  2006 was a change versus status quo election. Democrats controlled nothing, Republicans controlled everything.  That will not be the case in 2008, things will be much more complicated, looking at 2008 through a 2006 prism is insane.


by Charlie Cook on Thu Dec 21, 2006 at 12:28:43 PM EST
[ Parent ]

Re: Cook You can't use Ohio 2006 as representative (none / 0)

Agree that using Ohio 2006 is probably not best. Given what happened to Taft and the implosion in the Ohio Gop, this was a time period specific event. My preference is to use an evaluation system that uses Voter registration as a factor and throws out election extreme anomolies, such as the Ohio 2006 Dem landslide. Landslides don't make for a good point of comparison, which is one reason why the close elections of 2000 & 2004 do make for a good reference point. Also, when using Statewide elections in an indexing model you end up with the potential for skewed local results in instances that a candidate has a super strong base in a given County/Legislative District or Congressional District. For example, I'm sure Ted Strickland carried OH-06 by a much higher margin than a "normal" Dem Statewide candidate just as Former Cincinnati Mayor Ken Blackwell ran 13 points ahead of his Statewide % in his native Hamilton County.
I do like the idea of creating an evaluation Index that takes into account more than the Presidential vote and could include Voter Registration and weighted factors for State & Local voting histories. Thought it certainly would be a considerable piece of work.
"If you want others to be happy, practice compassion. If you want to be happy, practice compassion." Dalai Lama
by Predictor on Thu Dec 21, 2006 at 02:23:22 PM EST
[ Parent ]

IN Dem Voting (3.00 / 0)

In 2004, Bush carried IN by almost 60% while Senatory Evan Bayh carried IN by well over 60%.  This indicates that well over 20% of voters are splitting their ballots in at least one race.  A lot of IN voters are Republican by birth but not well represented by GOP politicians.  This creates very high numbers of Independent voters.

Rural areas are difficult to organize.  Door to door logistics are problematic.  Rural people often only gather at churches that don't address politics.  Township politics can have a large influence, because a one party rule of the township means control of lines of communication through the volunteer fire and road services such as snow plowing.  

IN is further complicated by open primaries.  Voters declare party affilitation at the poll.  If the only contested primary races are GOP, then even loyal Dem voters sometimes choose GOP primary ballots to vote against the fundamentalists.  This makes it very difficult to identify all the Democratic voters for GOTV.  Obviously we can count on strong Ds but even someone with a strong R history could be a Democratic voter in the general election.

It would really help rural areas to have caucuses rather than primaries.  This would allow Democrats that self-identify to "meet-up", slate candidates and identify issues.


by bakho on Thu Dec 21, 2006 at 09:12:28 AM EST

Re: IN Dem Voting (3.00 / 1)

True, there are some difficulties in rural areas, but there are also some advantages. Your point about voter registration in Indiana is probably the most difficult to overcome but the others are not so much.

I'm originally from a rural precinct in central Illinois and my mom and I worked on our precinct's first ever GOTV plan this time around (my mom is Democratic precinct chair).

It's actually not too hard to get your voters out to vote. For one thing, turnover in voters is usually far less in rural areas than in urban areas. So updating the information is not as time-consuming a task.

In addition, you personally know a greater percentage of your partisan (or independent) voters and have more opportunities to persuade them.

And as far as the difficulty of logistics in organizing. I mean, it's not easy, but it's not like rural voters live on the top of mt. everest. You're still likely to find most of your voters living in the main population center of the precinct (i.e. a small town). Which means canvassing and communicating is no different than in a precinct in an urban area. I would say that 75-80% of Democratic voters in our precinct lived in town. The 20-25% that live in rural areas are harder to reach just because you have to drive to everyone's house so it takes longer to talk to fewer people. BUT, since there is often also a better connection between the PCO and the neighbors, a phone-call usually works just as well as a door-to-door visit.

So I think the most important thing for mobilizing rural voters is to just follow Dr./Gov/Chairman Dean's plan. Do the 50-state strategy. Sign-up as the prencinct chair in your local precinct. Get your voter list, get 2-5 volunteers and start canvassing and GOTVing. I don't know for sure yet, but I'm guessing we upped our turnout by at least 10% this time over 2002. And our Democratic turnout was close to 80% (maybe higher).

It can be done.


by adamterando on Thu Dec 21, 2006 at 10:28:40 AM EST
[ Parent ]

Re: How Presidential vote understimates Dem Voting (none / 0)

jeu-de-voiture-gratuit
jeu-enfant-gratuit
jeu-gratuit
jeu-gratuit-cadeaux
jeune
jeu-pc-gratuit
jeu-video-gratuit
jeux
jeux2
kazaa
kazaa-gratuit
latinas
lesbian
lesbienne
limewire
lingerie
logiciel
logiciel2
logiciel-gratuit
logiciels
logiciels2
logiciels-gratuit
manga
massage
mature
messenger
messenger-gratuit
models
morpheus

movie
mp3-gratuit
msn
msn-gratuit
mure
music-gratuite
musique-gratuite
musiques-gratuites
nero
nero-gratuit
noire
nu
nude
nudiste
orgasme
orgie
parole-gratuit
paroles-gratuit
partition
partitions
penis
photo
photo2
photo-gay-gratuit
photo-porno-gratuit
photo-sexe-gratuit
photo-sex-gratuit
pied
pipe
poitrine
porn
porn-gratuit
porno
porno2
pornographie
porno-gratuit
pps-ppt
programme
pussy

rasee
real-player
recette
recettes
rousse
sado
safari
salope
sex
sex2
sexe
sexe2
sexe-amateur-gratuit
sexe-gratuit
sex-gratuit
sex-gratuit-beurette
sexuelle
sexy
shareaza
skype
sms-gratuit
sodomie
soluce
solution-jeu
spectacle
sport
sportive
spybot
suce
suceuse
sudoku-gratuit
tarot
tarot-gratuit
tatouage
tatouages
teen
tele
telechargement
telechargement2

telechargement-antivirus
telechargement-chanson
telechargement-chansons
telechargement-divx
telechargement-emule
telechargement-film
telechargement-film-gratuit
telechargement-gratuit
telechargement-kazaa
telechargement-logiciel
telechargement-logiciel-gratuit
telechargement-logiciels
telechargement-messenger
telechargement-movie
telechargement-mp3
telechargement-msn
telechargement-music
telechargement-musique
telechargement-nero
telechargement-parole
telechargement-paroles
telechargement-porn
telechargement-porno
telechargement-sex
telechargement-sexe
telechargement-x
telechargement-xxx
telecharger
telecharger2
telecharger3
telecharger-antivirus
telecharger-antivirus2
telecharger-chanson
telecharger-chansons
telecharger-divx
telecharger-emule
telecharger-film
telecharger-gratuit
telecharger-jeu-gratuit

telecharger-kazaa
telecharger-logiciel
telecharger-logiciels
telecharger-messenger
telecharger-movie
telecharger-mp3
telecharger-msn
telecharger-music
telecharger-musique
telecharger-nero
telecharger-parole
telecharger-paroles
telecharger-porn
telecharger-porno
telecharger-sex
telecharger-sexe
telecharger-x
telecharger-xxx
television
tennis
tit
toon
tourisme
touristique
tout-gratuit
traducteur-gratuit
transsexuelle
truc
tuning
tv
vacances
video

video2
video-comique
video-gratuit
video-porno
video-porno2
video-porno-gratuit
videos
videos2
videos-comiques
video-sexe-gratuit
video-sex-gratuit
video-x-gratuit
vlc
voiture
voyage
voyager
voyeur
wallpaper
webcam
winamp
winmx
winrar
winzip
x
x2
x-gratuit
xxx
xxx-gratuit
yoga

37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101

48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
120
120
121
122
123
124
125
126
127
128
129