Republican presidential candidates, from left, former Pennsylvania Sen. Rick Santorum, former House Speaker Newt Gingrich, Rep. Michele Bachmann, R-Minn., former Massachusetts Gov. Mitt Romney, Texas Gov. Rick Perry, Rep. Ron Paul, R-Texas, businessman Herman Cain and former Utah Gov. Jon Huntsman stand at the podium to answer questions during a debate at the Reagan Library Wednesday, Sept. 7, 2011, in Simi Valley, Calif. (AP Photo/Jae C. Hong)