Rendell, Specter, and Biden, anyway.
Though I can't really imagine why. He's gonna have a hell of a time getting reelected, as far as I can tell, and no matter what side of the aisle he's running for, he's got a questionable last few years under his belt.
I actually like Specter, for what it's worth. Not on everything (not on all that much, to be honest), but I respect him for sticking to his convictions, especially when it's in the face of party mandate, which it's prone to do quite often. Which probably wouldn't make him the most ideal candidate for the Dems in the senate, right?
In any case, I'm glad he recognizes the desperate need for moderate Republicans at this point, and good for him for doing so.
Anyway, I put the odds at 50 to 1.