Joe Biden

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U.S. Vice President Joe Biden, right, and Italian Premier Mario Monti review the honor guard at Rome's Chigi palace Premier's office, Monday, March 18, 2013. Joe Biden led the U.S. delegation to newly elected Pope Francis' installation in Rome. (AP Photo/Alessandra Tarantino)

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Vice President Joe Biden swears in CIA Director John Brennan in the Roosevelt Room of the White House, March 8, 2013. (White House)

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Vice President Joe Biden addresses the American-Israeli Public Affairs Committee (AIPAC) 2013 Policy Conference, Monday, March 4, 2013, at the Walter E. Washington Convention Center in Washington. (AP Photo/Susan Walsh)

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Vice President Joe Biden, Senate Minority Leader Mitch McConnell of Ky., left, Rep. Shelia Jackson Lee, D-Texas, right, and others arrive on Capitol Hill in Washington, Tuesday, Feb. 12, 2103, for President Barack Obama's State of the Union address during a joint session of Congress. (AP Photo/Charles Dharapak, Pool)

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Vice President Joe Biden talks with House Speaker John Boehner of Ohio before President Barack Obama's State of the Union address during a joint session of Congress on Capitol Hill in Washington, Tuesday Feb. 12, 2013. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama gestures toward Vice President Joe Biden and House Speaker John Boehner of Ohio before giving his State of the Union address during a joint session of Congress on Capitol Hill in Washington, Tuesday Feb. 12, 2013. (AP Photo/Charles Dharapak, Pool)

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President Barack Obama, flanked by Vice President Joe Biden and House Speaker John Boehner of Ohio, gestures as he gives his State of the Union address during a joint session of Congress on Capitol Hill in Washington, Tuesday Feb. 12, 2013. (AP Photo/Charles Dharapak, Pool)

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Vice President Joe Bidden is sworn in for his second term on the West Lawn of the U.S. Capitol Building at the 57th Presidential Inauguration Ceremony, Washington, D.C., Monday, January 21, 2013. (Andrew Harnik/The Washington Times)

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Vice President Joe Biden hugs his wife, Jill Biden after being sworn in for his second term on the West Lawn of the U.S. Capitol Building at the 57th Presidential Inauguration Ceremony, Washington, D.C., Monday, January 21, 2013. (Andrew Harnik/The Washington Times)

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President Barack Obama and Vice President Joe Biden place a wreath at the Tomb of the Unknowns at Arlington National Cemetery in Arlington, Va., Sunday, Jan. 20, 2013. (AP Photo/Susan Walsh)