What’s George W. Bush’s biggest regret as president? That he didn’t privatize Social Security, he told a group in Chicago on Thursday. The former president also said, "I have zero desire, just so you know, to be in the limelight. I don't think it's good for the country to have a former president criticize his successor. You're not going to see me giving my opinions in the public arena, until I start selling my book. I'm going to emerge then submerge." His book, Decision Points, comes out November 9.