Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, right, reacts to a comment by Rep. Ron Paul, R-Texas, during a Republican presidential debate Wednesday, Feb. 22, 2012, in ... more 

Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, right, reacts to a comment by Rep. Ron Paul, R-Texas, during a Republican presidential debate Wednesday, Feb. 22, 2012, in Mesa, Ariz. (AP Photo/Jae C. Hong) less