Tom Holbrook reports:

Jay DeSart and I have done some work over the years on using September state-wide trial-heat polls to predict presidential election outcomes in the states. We pool state-level data from 1992-2008 and use the Democratic candidate’s share of the two-party vote in state-level September polls (averaged across publicly available polls), a lagged (four elections) vote variable, and the Democratic candidate’s share of the vote in national trial-heat polls in the last half of September to predict the election outcomes. While the other variables are important to our model, the September polling average is the strongest predictor.  Jay has been good enough to update our model and provide forecasts for the 2012 election.

Those forecasts are above.  More here.

[Cross-posted at The Monkey Cage]

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John Sides is an associate professor of political science at George Washington University.