"After months of consideration, I have decided not to seek reelection in 2012. There are serious challenges facing our State and nation, like a $14 trillion debt and America's dependence on foreign oil. It is more important I spend my time and energy trying to solve these problems than to be distracted by a campaign for reelection.
Translation: I fear having the crap kicked out of me by the Tea Party next year. This is especially true since you consider that conservatives mopped up the floor with democrats in the state this past year.