Third Edition: Pawlenty's In, Thune's Out, And The 'Invisible Primary' Is Slowly Drawing To A Close. After months of masking their intentions while nimbly navigating the invisible primary, White House candidates are beginning to show their hands. Former Minnesota Gov. Tim Pawlenty became the first top-tier candidate to formally announce an exploratory committee this month, and former House Speaker Newt Gingrich is close to doing the same - moves that will likely trigger a run of announcements from other contenders in the coming weeks. With the Iowa caucuses tentatively slated for February 6, 2012, candidates have roughly 10 months left...