Over the past nine months, Republicans have close the Democratic margin in the national generic ballot by 6.3%:
House Generic Ballot Polling, Pre-2008 Election vs. Current
|
Democrats |
Republicans |
| Pre-2008 Election* |
48.6% |
39.9% |
| Current** |
42.6% |
40.2% |
*Simple mean of final poll from eight polling firms who conducted generic ballots from October 25th forward. Seven of those can be found here, and the eighth is the final Rasmussen generic ballot from the 2008 election.
**Current Pollster.com generic House ballot regression line.
The first thing that needs to be understood when looking at these numbers is that the generic House ballot really is an accurate snapshot of national voter opinion. For example, Democrats won the 2008 national House vote by 8.88%, extremely close to the 8.7% margin predicted by the final polls. 2008 was not a fluke, either. A quick look at final generic ballot averages and final national results show that the generic ballot is a useful indicator of national popular preference at any given time:
House Generic Ballot Vs. Final Result, 1998-2008
While six elections is a small sample size, the overall mean error rate is a low 1.8%, and the median is an even lower 1.5%. Even in the event of a large error rate of 3.7%, as experienced in 2006, a 6.3% swing toward Republicans is still quite significant.
The second thing to note about these numbers is that while the margin has narrowed significantly, Republicans have not gained any new supporters. Rather, all of the movement has come from Democratic losses. The continuing deterioration of the economy (and yes, a slower rate of decline is still a decline) is pushing voters out of the Democratic camp, but those same voters are not embracing Republicans.
The bottom line is that there are a lot of voters up for grabs right now, many more than we are used to seeing in our polarized era. Thinning pocketbooks can alter political allegiances in significant ways.
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