Three key states — Virginia, Indiana and Ohio — have polls that close by 7:30 p.m. ET. If Obama wins just one of these, McCain's chances go from slim to next-to-none. If Obama wins two or three, look for early talk of a Democratic rout. But if McCain takes all three, to channel Dan Rather, the night will be as long as the first-place winner in a Beyoncé–Jessica Simpson hair-extension contest.