Here are the six states to watch between 7pm and 8pm tomorrow night:
Virginia and Indiana after the last polls close at 7pm, Ohio and North Carolina after 7:30pm, and then Pennsylvania and Florida after 8pm.
These are the canaries in the coal mine.
McCain campaign manager Rick Davis conceded on "This Week" that John McCain has to win five out of six of these states to have a viable path to the presidency.
He could get there by holding all of the Bush states -- Indiana, Virginia, Ohio, Florida, and North Carolina -- and losing Pennsylvania, and then sacrificing Iowa and New Mexico.
But he will then need to secure Nevada and Colorado and all the rest of the Bush states later in the evening.