The Invisible Primary, 3/2

Mitt Romney: Tracking the GOP race to 2012 Mitt Romney made national TV appearances--on "The View," "Today," and "Sean Hannity"-- to promote his new book ; tonight, he and Sarah Palin will have a late-night talk-show duel, as Palin appears on Jay Leno and Romney on Letterman; Palin will deliver the keynote address at Friday's Ohio Right to Life forum in Columbus; Tim Pawlenty endorsed Rep. Roy Blunt (R-MO) for Senate; Newt Gingrich is launching a Balanced Budget campaign; and Bobby Jindal has assembled...