Nate Silver: State polls hint at national lead for Obama
Yes, I am deliberately cherry-picking a bit. But the discrepancy seems to hold if you look at the data in a more comprehensive way. Nor is it an unusual feature of the FiveThirtyEight model. Rather, pretty much every method for evaluating the election based on state polls seems to hint at a very slight popular vote lead for Mr. Obama, along with an Electoral College one.
In the table below, I’ve listed the current forecasts at seven different Web sites that use state polls, sometimes along with a modicum of other information like a state’s past voting history, to produce predictions of the popular vote in each state.
The first of these sites is FiveThirtyEight. The others, in the order that they’re listed in the table, are Electoral-Vote.com; Votamatic, by the Emory University political scientist Drew Linzer; HuffPost Pollster; Real Clear Politics; Talking Points Memo’s PollTracker; and the Princeton Election Consortium, which is run by Sam Wang, a neuroscientist at Princeton. These are pretty much all the sites I’m aware of that use state polling data in a systematic way.
You can see that the various projections strongly agree with another, for the most part, in making “calls” about individual states. The only state where different sites show different candidates ahead right now is Florida, where Talking Points Memo gives Mr. Obama a nominal 0.2-percentage point lead while the others (including FiveThirtyEight) have Mr. Romney slightly up instead. There are also four states — New Hampshire, Iowa, Colorado and Virginia — in which some methods show an exactly tied race while others give Mr. Obama the lead.
http://fivethirtyeight.blogs.nytimes.com/
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