Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles at his primary night rally in Grand Rapids, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Paul Sancya)

Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles at his primary night rally in Grand Rapids, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Paul Sancya)
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles at his primary night rally in Grand Rapids, Mich., Tuesday, Feb. 28, 2012. (AP Photo/Paul Sancya)
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