2 Factors

I'm still cautiously optimistic about Tuesday for 2 reasons. First - Obama has multiple paths to victory, whereas McCain only has one route and everything has to go perfect. Second - I still feel that the turn out will be higher than the "likely voters" (those that have previously voted), and almost all of the new voters have been brought in by democrats - I think there are a million more Dems registered in Pennsylvania than Republicans - and should be enough to overcome any "Bradley effect."