Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, speaks at primary night watch party in Lafayette, La., Tuesday, March 13, 2012. (AP Photo/Gerald Herbert)

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, speaks at primary night watch party in Lafayette, La., Tuesday, March 13, 2012. (AP Photo/Gerald Herbert)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, speaks at primary night watch party in Lafayette, La., Tuesday, March 13, 2012. (AP Photo/Gerald Herbert)
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