On the heels of last night’s debate between Republican Rick O’Donnell and Democrat Ed Perlmutter in Colorado’s 7th Congressional district, KUSA-TV is out with a new SurveyUSA poll showing Perlmutter with a commanding 17-point lead in the race, 54-37. That’s a huge jump from the last SUSA poll in August showing the race a 45-45 tie. All caveats about putting too much stock in any given poll still apply, so be on the lookout for further polling to see if this race has really gotten away from O’Donnell.
All caveats, indeed! First, this poll was released on the heels of the debate, but it was taken before it. But that’s not what really caught my eye here.
I looked at the raw numbers in both the August iteration that showed the race a toss-up and the new one showing a Democratic rout. In both, Perlmutter had an overwwhelming amount of support from Democrats, losing 4 points to O’Donnell in both. Then I noticed that Perlmutter had a 25 point advantage with self-described independents. Hm, not much change there, either. The two polls taken together do show a slip in Republican support for O’Donnell, dropping from 85%-10% to 76%-14%; that fits the meme I have been pushing which is that it is all about the GOP getting self-identified Republicans to come home to the party by election day. However, that amount of change in Republican support cannot explain the diffference between the two surveys’ topline results.
The earlier survey consisted of 44% Republicans and 33% Democrats. The newer survey consists of 38% of each. Given the nearly monolithic support Perlmutter is getting from self-identified Democrats, the change in partisan composition in the surveys would account for most of the movement shown between the two surveys.
Why this occurred is anyone’s guess. Was there widespread changes in the self-identification of people in the district? Possible, but not likely. Were normally loyal GOPers reluctant to participate in the survey this time around? More possible– and then the question is if it was a one-time phenomenon due to other things happening (such as the Broncos playing) when the poll was conducted, or does it mean that Republicans have lost interest in the race? Were normally loyal GOPers overly represented in the August sample? Possible, but not likely; the district has more Republicans than Democrats.
Obviously, it is much better to have good results for your candidate than bad results. That said, this looks like one of those cases where surprising results were due to the sample having a mix that is less representative of the whole than normal.