Edward M. Pio Roda/CNN

The Republican candidates at the CNN Republican National Security Debate held at Constitution Hall. Left to right: Former Pennsylvania Sen. Rick Santorum, Texas Rep. Ron Paul,  Texas Gov. Rick Perry, former Gov. of Massachusetts Mitt Romney, former CEO of Godfather’s Pizza Herman Cain, former Speaker of the House Newt Gingrich, Minnesota Rep. Michele Bachmann and former Gov. of Utah Jon Huntsman.