On election eve, watch PA. If Romney appears to be doing very well in PA (minus Philly, which will inevitably hold back its results until after midnight), to the point where Philly going 120% for Obama might not matter, then it's good nite for Obama.
Corbett isn’t going to tolerate that kind of garbage from Philadelphia anymore, especially since after we took back Harrisburg in 2010 we already won on the Voter ID front.
I have faith that if the Dems have to try to pull off massive fraud, that Corbett will be ready to litigate them into oblivion.