Former Massachusetts Gov. Mitt Romney shakes hands at a campaign rally at Capital University in Bexley, Ohio, on Wednesday. Justin Sullivan/Getty Images hide caption

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Prospective voters listen to Republican presidential candidate Newt Gingrich, accompanied by his wife, Callista, on Feb. 7 at Cincinnati's Price Hill Chili restaurant. Evan Vucci/AP hide caption

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West Virginia Sen. Joe Manchin, a Catholic up for re-election this year, was one of the Democrats who spoke out against the White House birth control policy before it was altered. J. Scott Applewhite/AP hide caption

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As Americans prepare to file their tax returns, lawmakers take up a debate over changing wealthy earners' tax rate. Jacquelyn Martin/AP hide caption

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Ron Paul greets supporters in Meredith, N.H., on Sunday, two days before he placed second in the state's Republican primary. Stephan Savoia/Associated Press hide caption

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Republican presidential hopeful Mitt Romney greets supporters during a campaign rally in Columbia, S.C., on Wednesday. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images