Scenario that would keep us up late.
McCain wins Ohio and Florida....he's polling within the margin of error there, so it's not out of the question.
Obama wins Virginia, which would seem to put it in the bag for him....BUT...McCain pulls an upset in Pennsylvania.
While this doesn't seem likely given the polling, there is no early voting in Pennsylvania, so the urban voters might opt to not stand in the 4+ hour lines to vote, while turnout will be big in the T, where people vote against Obama because of his "bitterness and guns and religion" remarks during the primary.
Then the race would come down to the west, with Colorado and Nevada being decisive.
If that happened I'll end the night with more gray hair than McCain, and McCain could end up being president.
