Jack - so far, Tim Pawlenty, governor of Minnesota, Mitt Romney, former governor of Massachusetts, Newt Gingrich, Rick Santorum, Herman Cain and possibly Michelle Bachman. I think it very unlikely that Sarah Palin will run - this bus tour was all about garnering publicity and therefore money for her public speaking gigs, and also putting the kibosh on Mitt Romney's chances by competing with the announcement of his run. She's still hosting a show on Fox, and if she runs as a candidate that will have to go off the air because of legislation about equal air time. Sarah's all about the money, I think. You can google the others. The only serious contenders IMHO are Pawlenty and Romney. The others have made so many gaffes of one kind or another that they'd be an open target for Democratic campaigners.