Former South Carolina Gov. Mark Sanford arrives to give his victory speech Tuesday in Mount Pleasant, S.C. Sanford won back his old congressional seat in the state's 1st District in a special election. Rainier Ehrhardt/AP hide caption

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Democrat Elizabeth Colbert Busch and her Republican opponent, former South Carolina Gov. Mark Sanford, debate in Charleston, S.C., on April 29. Randall Hill/Reuters/Landov hide caption

itoggle caption Randall Hill/Reuters/Landov

Democrat Elizabeth Colbert Busch and former South Carolina Gov. Mark Sanford debate for the South Carolina 1st Congresional special election in Charleston, S.C., on Monday. Randall Hill/Reuters /Landov hide caption

itoggle caption Randall Hill/Reuters /Landov

Former Florida Governor Jeb Bush speaks at the Reagan Library after autographing his new book 'Immigration Wars: Forging an American Solution' on March 8 in Simi Valley, Calif. Getty/AP hide caption

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Mark Sanford, seen at the GOP convention last summer in Tampa, Fla., saw his career as South Carolina's governor implode in 2009 when he admitted to an extramarital affair. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images