Great article summarizing when polls close and how the night might unfold...
7 PM EST. Polls close in Virginia and Georgia, as well as most of Florida and most of New Hampshire.
Virginia, for my money, is the most important state in this election. If John McCain loses it, his path to victory is exceptionally narrow—he would need to pull out an upset in Pennsylvania, while holding on to Florida and Ohio, and avoiding a sweep out West. Barack Obama has considerably more ways to win without Virginia, but a failure to close out the state would suggest at best a more circuitous route to victory. As Obama remains about five points ahead in most polls of Virginia, what we're really looking for is a quick call on anything before 8 PM that would indicate that the map has indeed changed from 2004, and not in McCain's favor.
Georgia and New Hampshire are a bit less essential electorally, but they may tell us the most about whether the polls are off in this election. If there's one state where Obama is likely to overperform his polls, it's in Georgia, where 35 percent of early voters are African-American, and where almost 30 percent of them did not vote in 2004. These are the sorts of voters that may erroneously be screened out by "likely voter" models that rely on past voting history. Obama could not only carry the state, but he might help boost Jim Martin to victory in the U.S. Senate race there—giving the Democrats a plausible path to a 60-seat caucus.
On the other hand, if there is any state where the polls might overestimate Obama's numbers, it's in New Hampshire, where nearly the entirely electorate is white and where Obama was famously upset by Hillary Clinton during the primaries. If McCain holds Obama to within about five points in New Hampshire—closer than any current polls—we may need to be worried about some sort of Bradley Effect.
http://www.newsweek.com/id/167186Edit to add a few paragraphs.