Originally Posted by Bacchus
Unless you live in one of seven swing states your vote does not count.
That's essentially true.
Although I think we'll have a pretty good clue what will happen early in the evening by looking at the numbers in a non-swing state. There's been some suggestion of serious movement in PA and this happens in almsot every campaign, although in the end it usually turns out to be a hoax. There have been a few respected polls that put it around 5 or below, though.
If on election night Obama wins PA by less than 4 points, he is toast nationally.