I'm not really sure who is term-limited or not, so I just kept CO, GA, MN, & others Repub, since I dunno about Bill Owens, Sonny Perdue, and Tim Pawlenty, etc.
I think that PA, OR, MI, and AL are all tossups, so I just stuck with the incumbent just to predict SOMETHING. These will also be the closest races.
CA, OH, NY, and MA are coming back to us.
WI, ME, NH, IA, and IL are going to switch the next election cycle.
Everything else stays the same.
edit: I don't really know why I thought that the gov. of NH had a low approval rating. Lynch keeps his seat.
As an edit, I change my prediction on Arnold, and believe now that he will, in fact, keep his seat.
Also, AR will be a tossup.