Yes, Hillary Clinton's win last night was a shocker but it's not as though the signs weren't there that the tide was turning. As I wrote yesterday, the Zogby and Suffolk University daily tracking polls, while not showing a stall in Obama's support, did show a halting of Clinton's slide in New Hampshire. Specifically, it appeared to me that this was due to a particularly strong Monday, leading me to suspect a "tighter than expected race." The comments to the post were skeptical at best, my favorite:
A tight race... whistlin' past the graveyard... It's over for Hillary.
The fact is, the evidence was there, particularly when you look at the final Rasmussen Reports survey, which, when compared to the previous Rasmussen poll, showed a Monday surge.
| 1/5-7 | 1/5-6 | |
| Obama | 37 | 38 |
| Clinton | 30 | 28 |
In other words, when Monday was added to the polling time frame, Clinton gained 3 points on Obama, a huge impact for just one day out of the 3 polled to have. The reason it was so well hidden within the polling at large is that all of the polls were rolling averages of 2 or 3 days, thus diluting the sudden shift that took place toward Clinton.
John Zogby confirms this is exactly what he found in his tracking poll (h/t TPM):
My polling showed Clinton doing well on the late Sunday night and all day Monday - she was in a 2-point race in that portion of the polling. But since our methods call for a three-day rolling average, we had to legitimately factor the huge Obama numbers on Friday and Saturday - thus his 12 point average lead. Unfortunately, one day or a day-and-a-half does not make a trend and we ran out of time.
Because the shift began late Sunday and was evident all of Monday, Clinton's turnaround likely had more to do with the debate than the tearful moment, the wall-to-wall coverage of which didn't kick in until Monday night's evening news. It should be noted too that CNN replayed the debate Sunday night.
If there's a lesson here it's not that all polls suck, but rather that pollsters would be well-advised to get large one day samples, particularly on election eve, rather than rely almost exclusively on multiple day rolling averages. With the primary schedule condensed as it is (only 5 days between Iowa and New Hampshire...) and an unprecedented access to coverage of the candidates, we're likely to have more 1 day swings like the one that changed the game for Clinton in New Hampshire yesterday.
Update [2008-1-9 14:58:54 by Todd Beeton]:yellowdem1129 has more.
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