President Obama waves after signing the Affordable Care Act at the White House on March 23, 2010. Chip Somodevilla/Getty Images hide caption

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Republican presidential candidate Mitt Romney makes a pie shell with store owner Linda Hundt during a campaign stop Tuesday in DeWitt, Mich. Joe Raedle/Getty Images hide caption

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Yard signs supporting U.S. Senate candidate Richard Mourdock in Columbus, Ind., on April 23. Mourdock went on to beat incumbent Sen. Dick Lugar in a primary race that received national attention, and a flood of money from outside Indiana. Curtis Tate/MCT /Landov hide caption

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President Obama meets with actor George Clooney, U.S. Special Envoy for Sudan Princeton N. Lyman, and human rights activist John Prendergast (far left) at the White House on March 15. Pete Souza/White House hide caption

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Pastor Warren H. Stewart of First Institutional Baptist Church in Phoenix joins other clergy members to demonstrate against SB 1070. John Rose/NPR hide caption

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A bilingual sign announces a polling place in the 2008 general election on November 4 in Phoenix, Ariz. David McNew/Getty Images hide caption

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A campaign worker hangs a sign at a campaign stop for Republican presidential candidate Mitt Romney in Lorain, Ohio, on Thursday. Jae C. Hong/AP hide caption

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President Obama's re-election campaign has released four new Spanish-language ads, each ending with the phrase: "Esta eleccion si importa," which in English means, "This election does matter." barackobama.com hide caption

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House Speaker John Boehner administers the House oath to Rep. Jason Altmire, D-Pa., on Jan. 5, 2011. Alex Brandon/AP hide caption

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Sen. Bill Frist (left) gives a mock smallpox vaccine during a training session in 2003. Frist, a surgeon, once gave CPR to a visitor who collapsed in a Senate office building. Susan Walsh/AP hide caption

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Mitt Romney holds a flier titled "Women & The Obama Economy" as he speaks in Hartford, Conn., Wednesday Steven Senne/AP hide caption

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Supporters of Texas Rep. Ron Paul cheer as the Republican presidential candidate speaks on March 28 at the University of Maryland in College Park, Md. T.J. Kirkpatrick/Getty Images hide caption

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President Obama announces support for building an oil pipeline from Oklahoma to Texas, Thursday in Cushing, Okla. Tom Pennington/Getty Images hide caption

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