Last week, FBI investigators and a Watertown, Mass., police officer investigate the scene near the boat where bombing suspect Dzhokhar Tsarnaev was hiding. Democrats have argued that the way the government responded to the Boston attacks makes a case for not cutting too deeply. Kevork Djansezian/Getty Images hide caption

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President Obama makes a statement in the White House briefing room just a few hours after the bombings at the Boston Marathon on April 15. Win McNamee/Getty Images hide caption

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First lady Michelle Obama greets students at Harper High School in Chicago on Wednesday. Twenty-nine current or former Harper students have been shot in the past year, eight of them fatally. Nancy Stone/AP hide caption

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Sen. Rand Paul, R-Ky., shown speaking at a meeting of the U.S. Hispanic Chamber of Commerce on March 19, is promoting libertarian ideas as a way the Republican Party can be more inclusive. Alex Wong/Getty Images hide caption

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President Obama signs a series of executive orders on gun control Jan. 16 surrounded by children who wrote letters to the White House about gun violence. They are, from left, Hinna Zeejah, Taejah Goode, Julia Stokes and Grant Fritz. Mark Wilson/Getty Images hide caption

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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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President Obama shakes hands with his nominee to head the Defense Department, former Sen. Chuck Hagel, at the White House on Jan. 7. John Brennan, Obama's choice for director of the CIA, looks on. Alex Wong/Getty Images hide caption

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President Obama gives his first inaugural address on Jan. 20, 2009. Ron Edmonds/AP hide caption

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Vice President Joe Biden leads the first meeting of the working group to explore solutions following the Newtown shooting with Philadelphia Police Commissioner Charles Ramsey and other law enforcement leaders on Dec. 20. Chip Somodevilla/Getty Images hide caption

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"I'm optimistic we may still be able to reach an agreement that can pass both houses in time," the president said after meeting with congressional leaders at the White House on Friday. Evan Vucci/AP hide caption

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