"in a heavily polarized election like this all you really need to do is persuade 1-2% of the population."
PBS Washington Week commentator recently said there are perhaps 3 million genuinely persuadable voters, in total, in ALL of the swing states who will serve as tie breakers this election, because most people have their opinions locked in and won't change no matter what.
And it sounds like a lot of those might actually be people who voted for Obama in 2008, thinking they were voting for FDR, but now realize they got H. W. Bush, and are debating whether to give Obama more time or just try the other guy.
Not sure what turnout assumptions are made in projections such as http://fivethirtyeight.blogs.nytimes.com/, but when he was not in the establishment during last cycle, he had projections based upon varying levels of turnout here:
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