Updated prediction
This race tightens (at least nationally) and it seems McCain is surging into the last weekend (will be a 2 to 3 pt race by all polls).
Obama takes VA/FL on that Tuesday to win with 52% of the popular vote and 313 electoral votes.
Sarah Palin finishes very strong (including her SNL appearance) and becomes the chosen one for 2012 and the Republican party.
You lost me on the Palin part. NO WAY. Republicans will want to erase this ticket from their memory banks. They will need an entirely new approach.