Mitt Romney (left) and former President George H.W. Bush in 2007. Ben Sklar/Getty Images hide caption

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Wade Goodwyn reporting

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Former House Speaker Newt Gingrich, who wants to the the 2012 Republican presidential nominee, during a campaign event in Camp Hill, Pa., on Saturday (March 24, 2012). Jessica Kourkounis/Getty Images hide caption

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Don't worry, the rabbit's OK, says Herman Cain. It's taxes on businesses that he thinks are too painful. CainConnections hide caption

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Former House Speaker Newt Gingrich. Win McNamee/Getty Images hide caption

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Gingrich: Some 'Brand New Players' Might Emerge At GOP Convention

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Republican presidential candidate and former Massachusetts Gov. Mitt Romney at his victory party Tuesday in Schaumburg, Ill. Chip Somodevilla/Getty Images hide caption

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Ari Shapiro on 'Morning Editon'

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Republican presidential candidate Rick Santorum with supporters Tuesday night in Lafayette, La. Louisiana's primary is on March 24. Sean Gardner/Getty Images hide caption

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Mara Liasson on 'Morning Edition'

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