I think Obama will win, but not by as large a margin as many seem to think. I even heard a girl in my class say "Obama is already gonna win, so I'm not even gonna bother to vote." Why anyone, no matter their political alignment, would think this is beyond me.
Everyone no matter how bad you think one or both candidates are please at least vote, if you don't you have no right to even commentate on politics. (Note this isn't to say those who CAN'T vote, whether too young or whatever, fall under the "no right to commentate" umbrella)