Shipping containers sit at a port in Tianjin, China, on Feb. 28. Alexander F. Yuan/AP hide caption

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Attendees at Monday's Mitt Romney rally in Mansfield, Ohio, recite the Pledge of Allegiance. Charles Dharapak/AP hide caption

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President Clinton signs the welfare reform law on Aug. 22, 1996. Stephen Jaffe /Reuters /Landov hide caption

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Republican vice presidential candidate Paul Ryan speaks Saturday in Florida. Gerardo Mora/Getty Images hide caption

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U.S. Republican vice presidential hopeful Paul Ryan greets supporters during a campaign rally in High Point, N.C., on Sunday. Saul Loeb/AFP/Getty Images hide caption

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What a difference 14 years makes. Here, Bill Clinton departs the White House on July 31, 1998, after telling reporters he wouldn't take questions about the Monica Lewinsky investigation. Tim Sloan/AFP/Getty Images hide caption

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President Obama delivers remarks at a campaign event on July 5 in Parma, Ohio. Chip Somodevilla/Getty Images hide caption

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U.S. Senate candidate Richard Mourdock, right, applauds as Republican presidential candidate Mitt Romney speaks during a campaign event at Stepto's Bar-B-Q Shack in Evansville, Ind., Saturday. Scott Olson/Getty Images hide caption

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Republican presidential candidate Mitt Romney speaks during the national convention of the Veterans of Foreign Wars in Reno, Nev., on Tuesday. In the speech, Romney attacked the Obama administration's approach to China. Justin Sullivan/Getty Images hide caption

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Republican presidential candidate Mitt Romney speaks in Bow, N.H., on July 20. On his upcoming trip, Romney plans to make stops in the United Kingdom, Israel and Poland. Justin Sullivan/Getty Images hide caption

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President Obama is introduced by singer Ricky Martin at a fundraiser hosted by Martin and the LGBT Leadership Council at the Rubin Museum of Art on May 14 in New York. Pablo Martinez Monsivais/AP hide caption

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The U.S. Supreme Court justices — (first row, from left) Clarence Thomas, Antonin Scalia, Chief Justice John Roberts, Anthony Kennedy, Ruth Bader Ginsburg, (back row) Sonia Sotomayor, Stephen Breyer, Samuel Alito and Elena Kagan — pose at the Supreme Court in 2010. Chip Somodevilla/Getty Images hide caption

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President Obama's use of drones, and his direct involvement in whom they target, has both U.S. and international communities questioning the administration's secret drone policy. Kirsty Wigglesworth/AP hide caption

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Republican presidential candidate Mitt Romney and his wife, Ann, wave from a campaign bus on Friday at Scamman Farm in Stratham, N.H. Joe Raedle/Getty Images hide caption

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