Same-sex wedding cake topper figurines at Cake and Art in 2008 in West Hollywood, Calif. David McNew/Getty Images hide caption

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Tweets from GOP supporters scroll along the side of a large-screen display at the Republican National Convention in Tampa, Fla., on Aug. 28, 2012. Chip Somodevilla/Getty Images hide caption

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David Wilson (left) and Rob Compton embrace after being married by a Unitarian minister at the Arlington Street Church in Boston on May 17, 2004. They were one of the first couples in Massachusetts to be legally wed. Stan Honda/AFP/Getty Images hide caption

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Standing in front of the Constitution, President Obama delivers an address on national security and terrorism in 2009 at the National Archives in Washington. J. Scott Applewhite/AP hide caption

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Advocates for and against stronger gun laws demonstrate in the Pennsylvania Capitol on Jan. 23 in Harrisburg, Pa. Matt Rourke/AP hide caption

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Sens. John McCain, R-Ariz., and Lindsey Graham, R-S.C., confer at the start of a Senate Armed Services Committee hearing last week on the appointments of military leaders. McCain and Graham have been among the Republicans pushing the Obama administration for answers about the Benghazi attack. J. Scott Applewhite/AP hide caption

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