The guy from Zogby International, the polling place, called it pretty confidently for Kerry on the Daily Show tonight. He said that the majority of undecided voters usually break from the incumbent and are, essentially, waiting to make sure John Kerry doesn't have anything groundbreakingly wrong with him or isn't a dangerous minority. Sounds kinda similar to what went on in 2000, with Gore essentially being a third Clinton term, and the election being tight, a lot of the undecided voters went Bush and made it just close enough that the election could be decided by other means.
It's also worth noting that the Zogby guy said that if the election were simply between Bush and Not-Bush, Not-Bush would win in a landslide. You people don't like your President, and are essentially just worried about whether you think Kerry is gonna be worse.
One of the more interesting things, though, is that he said that, no matter what happens, with last-year's scandal, new paperless voting machines, all the ripping up of registrations this year and all the other assorted bullshit, odds are good that the winner's authority will take a while to be recognized. Personally, I still haven't recognized Bush's authority from the last election (though he did get a majority of the vote: he got 5, and Gore only got 4), so this doesn't change much for me, but it'll be interesting to see how the country reacts to yet another tight race under even more fishy conditions. That is, of course, if GW lets the election happen. PATRIOT says he can delay the election if there is a "threat". For as long as he wants.
Edit:
This is quite fitting. Apparently, 1/3 of the voters *already* call bullshit.