Mitt Romney shakes hands as he walks into the House Chambers during inaugural ceremonies at the State House in Boston in 2003. the Obama campaign sought to focus attention on Romney's tenure as Massachusetts governor. Elise Amendola/AP hide caption

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President Obama talks to German Chancellor Angela Merkel, French President Francois Hollande (upper left), NATO Secretary-General Anders Fogh Rasmussen (center) and other leaders during the official photo at Soldier Field in Chicago during the NATO summit Sunday. Jim Watson/AFP/Getty Images hide caption

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Caroline Maya, a 21-year-old college student, registers to vote for the first time at the Latinos for Obama booth outside the Grand Sierra Casino in Reno, Nev., Saturday. David Welna/NPR hide caption

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House Speaker John Boehner of Ohio, accompanied by fellow Republicans John Kline (left) of Minnesota and Jeb Hensarling of Texas, speaks about the student loan bill on Wednesday. Charles Dharapak/AP hide caption

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Hikers arrive at the post office in Caratunk, Maine, in 2011. Some of the rural post offices the U.S. Postal Service may close are relied on by Appalachian Trail hikers for supply drops on their trip from Georgia to Maine. Robert F. Bukaty/AP hide caption

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Republican presidential candidate Mitt Romney speaks with a staffer on the night of the Florida primary in January. Now that he's pivoting away from the primaries to the general election, Romney is expected to quadruple his staff soon. Joe Raedle/Getty Images hide caption

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A U.S. soldier watches members of the Afghan Public Protection Force arrive at a ceremony on the outskirts of Kabul on Thursday. Ahmad Jamshid/AP hide caption

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Mitt Romney waits to speak while being introduced Monday during a campaign stop in Mobile, Ala. Win McNamee/Getty Images hide caption

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This Nov. 4, 2008, file photo shows Republican Rep. Jean Schmidt being congratulated by supporters in Loveland, Ohio. Schmidt is up against three other Republicans in the March 6 primary. David Kohl/AP hide caption

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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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