Obama wins late deciders
More voters who made their decision anytime in the past month – including those who did not pick a candidate until Election Day — voted for Obama than the combined total of those who went for Hillary Clinton and John Edwards.
I've made myself a table listing the percentage of each county's population by race, with the 2004 Bush-Kerry vote, to try to get an idea of the likely racial demographics of each county's voters (this being the area with the biggest differences in the polls)