This is the end. Palin has done all she ever will for the McCain campaign, and it's not enough. She went up there and performed reasonably competently. She provided all the answers which will energize her base, while Biden gave rational, logical points with a minimum of fuss.
Problem is, Biden's base is already energized by two deeply polarizing personalities. He managed to come off much more experienced, which I think will play well, and Palin fed h her base its scraps (The ones who are angry about "those who believe in statistics over testimonials of honest men of good character") but it's not enough.
After seeing this, it's reasonably obvious. President Obama will be leading our nation in 2009, and I will bet on that. The usual suspects (like Brainsty, Whiplashed and B.A.C.) will proclaim that Palin somehow won by exceeding low expectations (she didn't wet herself, which is about the only way she could have come off worse than she has in the interviews) but the fact of the matter is, barring a revalation that Obama is a drug addict or McCain secretly traveled in time and rescued Jesus Christ, Plato, and our Camelot just to get the best advisers possible, we're through.