SEVEN SEATS TOO CLOSE TO CALL IN MY OPINION:
Minnesota (Pawlenty vs. Hatch)
Pennsylvania (Rendell vs. Swann)
Maine (Baldacci vs. Emery)
Ohio (Blackwell vs. Strickland)
Michigan (Granholm vs. DeVos)
Tennessee (Bredesen vs. Bryson)
Alaska (WTF will Murkowski do?)
I'm going to have to disagree. I don't think MN will be that competitive, nor will TN. I think the states that are tossups include IA, MI, ME, WI, CO, and CA. In addition to that, I think PA, OH, AK, OR, and possibly AR will be competitive. But that's just me.
Edit: George Ryan was found guilty, so IL won't be a tossup after all.