Rick Santorum

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** FILE ** In this April 2, 2012, file photo, then Republican presidential candidate former Pennsylvania Sen. Rick Santorum speaks in Shawano, Wis. (AP Photo/Jae C. Hong, File)

** FILE ** In this Feb. 22, 2012, photo Republican presidential candidate and former Massachusetts Gov. Mitt Romney, right, talks with fellow candidate, former Pennsylvania Sen. Rick Santorum, after a presidential debate in Arizona. On Monday night, May 7, 2012, Santorum endorsed Romney, saying "above all else" they agree that Obama must be defeated. (AP Photo/Jae C. Hong, File)

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** FILE ** In this April 4, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum sits at Bob's Diner in Carnegie, Pa. (AP Photo/Jae C. Hong, File)

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** FILE ** In this April 2, 2012, file photo, then-Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks in Shawano, Wis. (AP Photo/Jae C. Hong, File)

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Rick Santorum, a former Republican presidential candidate, prepares to speak at the National Rifle Association convention in St. Louis on Friday. Several delegates said they would back Mr. Santorum until he endorsed another candidate. (Associated Press)

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Mitt Romney picked up endorsements Thursday from two pro-life groups - the Susan B. Anthony List, which initially backed Rick Santorum, and National Right-to-Life - that looked past the presumptive GOP candidate's earlier pro-choice stand. (Associated Press)

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Rick Santorum turns to his wife, Karen, on Tuesday after announcing in Gettysburg, Pa., that he is suspending his run for president. Front-runner Mitt Romney said in Delaware that he will now start seriously pondering a list of vice-presidential prospects. (Associated Press)

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Former Sen. Rick Santorum of Pennsylvania embraces his wife, Karen, after announcing Tuesday that he is suspending his GOP candidacy for president. He cited the priority of a seriously ill child in his large family as a key reason for dropping out before the April 24 Pennsylvania primary. (Associated Press)

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Republican presidential candidate and former Pennsylvania Sen. Rick Santorum announces April 10, 2012, he is suspending his candidacy in Gettysburg, Pa. (Associated Press)

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Former Pennsylvania Sen. Rick Santorum, surrounded by his family, announces on Tuesday, April 10, 2012, in Gettysburg, Pa., that he is suspending his GOP presidential campaign. (AP Photo/Gene J. Puskar)

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**FILE** Republican presidential candidate and former Pennsylvania Sen. Rick Santorum pauses while speaking March 31, 2012, at the Faith and Freedom Coalition Presidential Kick-Off in Pewaukee, Wis. (Associated Press)

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** FILE ** Former Pennsylvania Sen. Rick Santorum campaigns for the Republican presidential nomination at Bob's Diner in Carnegie, Pa., on Wednesday, April 4, 2012. (AP Photo/Jae C. Hong)

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** FILE ** In this April 4, 2012, file photo, Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, center, holds a pair of boxing gloves at a campaign stop in Hollidaysburg, Pa. (AP Photo/Jae C. Hong, File)

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Republican presidential candidate and former Pennsylvania Sen. Rick Santorum sits April 4, 2012, in a booth at Bob's Diner in Carnegie, Pa. (Associated Press)

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Republican presidential candidate Rick Santorum, a former Pennsylvania senator, shakes hands with a patron at Bob's Diner in Carnegie, Pa., on Wednesday, April 4, 2012. (AP Photo/Jae C. Hong)

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Corey Essler, a volunteer for former Sen. Rick Santorum of Pennsylvania, a Republican presidential candidate, holds up a sign to woo voters in Menasha, Wis., on Monday. "You have the opportunity to shock the world," Mr. Santorum said. (Associated Press)

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Presidential candidate Rick Santorum, with wife Karen, shows off a cheese-head hat at Simon's Specialty Cheese in Appleton, Wis., on Monday. (Associated Press)