California 2010: Boxer V. Abel Maldnado or the current SD Mayor.
Florida 2012: Bill Nelson V. George P. Bush
California 2012: Diane Feinstein V. Arnold Schwarzenagger
Future Democratic Senate candidates for CA: Villaraigosa, Newsom, and Fabian Nunez(if Boxer and Feinstein ever retire)
Virginia 2010: Allen V. Warner(if neither are elected president)
I can't see Arnold in the Senate for some reason. I also can't see Allen returning to the Senate, ever. Though for some reason I think he could stand a chance being reelected to his old job as governor.