Left to right: Former Sen. Rick Santorum; Rep. Michele Bachmann; former House Speaker Newt Gingrich; former Massachusetts Gov. Mitt Romney; Rep. Ron Paul; former Minnesota Gov. Tim Pawlenty; entrepreneur Herman Cain. Emmanuel Dunand /AFP/Getty Images hide caption

itoggle caption Emmanuel Dunand /AFP/Getty Images

Tim Pawlenty in Iowa at the Fayette County Republican Party Spring Fundraiser, April 2, 2011. Martin Kaste/NPR hide caption

itoggle caption Martin Kaste/NPR