I talked to the University of Virginia’s Larry Sabato this morning about what he’s expecting. On the Pennsylvania Senate primary, he gives me reason to keep that champagne chilling:

The establishment in both parties probably won’t have a good day. The headliners will likely be Joe Sestak and Rand Paul. At this point it would be an upset if Arlen Specter or Trey Grayson wins.

He’s not making a call on Arkansas:

I suppose the big question in Arkansas is whether Blanche Lincoln can get 50% and avoid a runoff. The left is trying to teach her a lesson via Bill Halter, but they may be softening the Democrat up for the GOP in the fall.

And on the mood, Sabato says:

I don’t know how “angry” voters are — that storyline is exaggerated. But voters don’t seem to be in a mood to take direction from leadership, whether it’s Obama and Rendell in Pennsylvania or McConnell in Kentucky.