Rick Santorum

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ASSOCIATED PRESS Republican presidential candidate Rick Santorum speaks to reporters Sunday at a restaurant in West Bend, Wis. His chance of winning the state's primary is a long shot.

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Republican presidential candidate Rick Santorum smiles during a campaign stop in Platteville, Wis., on Saturday, March 31, 2012. (AP Photo/Jae C. Hong)

** FILE ** In this March 28, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum smiles at a bowling alley in La Crosse, Wis. Woe is Rick Santorum. The Republican presidential candidate complains that Mitt Romney and his allies are outspending him. (AP Photo/Jae C. Hong, File)

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Former Sen. Rick Santorum of Pennsylvania bowls during a campaign stop in La Crosse, Wis., on Wednesday. Mr. Santorum is running second in the delegate chase for the Republican presidential nomination. (Associated Press)

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Republican presidential candidate Rick Santorum leaves March 26, 2012, after speaking to reporters outside the U.S. Supreme Court building in D.C., as the court hears oral arguments on the challenges to the Affordable Care Act. (Andrew Harnik/The Washington Times)

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Republican presidential candidate Rick Santorum leaves after speaking to reporters in front of the U.S. Supreme Court building in Washington on Monday, March 26, 2012, as the court hears oral arguments on the Affordable Care Act. (Andrew Harnik/The Washington Times)

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Republican presidential candidate Rick Santorum speaks to reporters in front of the U.S. Supreme Court building in Washington on Monday, March 26, 2012, as the court hears oral arguments on the Affordable Care Act. (Andrew Harnik/The Washington Times)

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Rick Santorum gets ready to knock down some pins at a bowling alley in Fond du Lac, Wis., on Sunday. Mr. Santorum scored a big win in Louisiana on Saturday and moved on to Wisconsin in advance of the April 3 primary there. (Associated Press)

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Republican presidential candidate Rick Santorum speaks at the AFP Defending the Dream Conference in Milwaukee on Saturday, March 24, 2012. (AP Photo/Jae C. Hong)

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Republican presidential candidate former Pennsylvania Sen. Rick Santorum, waves a Etch-A-Sketch while criticizing the policies of GOP presidential candidate Mitt Romney at a rally in Shreveport, La., Friday, March 23, 2012. (AP Photo/Rogelio V. Solis)

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Republican presidential hopeful Rick Santorum departs after a campaign stop Thursday in San Antonio. The former Pennsylvania senator hopes to increase his delegate tally in states where local caucuses were just the first step in winning delegates to the convention. (Associated Press)

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Republican presidential candidate and former Pennsylvania Sen. Rick Santorum greets supporters March 21, 2012, after a rally in Mandeville, La. (Associated Press)

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Republican presidential candidate and former Pennsylvania Sen. Rick Santorum holds an Etch-A-Sketch toy on March 21, 2012, during a rally in Mandeville, La. (Associated Press)

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Former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, holds an Etch A Sketch during a rally in Mandeville, La., on Wednesday. (Associated Press)

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Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks during a campaign stop in downtown Moline, Ill., on Monday, March 19, 2012. (AP Photo/The Dispatch, Paul Colletti)

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Standing in front of a statue of Ronald Reagan on horseback, Rick Santorum campaigns for the Republican presidential nomination Monday in Dixon, Ill. Dixon was the boyhood home of the former president, whom Mr. Santorum cited in his remarks. (Associated Press)