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.
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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.
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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.
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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.
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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.
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