Joe Biden

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President Barack Obama stands with Vice President Joe Biden as he makes a statement in the Brady Press Briefing Room about policies he will pursue following the Newtown, Conn., school shootings, Wednesday, Dec. 19, 2012, at the White House in Washington. (AP Photo/Charles Dharapak)

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President Barack Obama stands with Vice President Joe Biden as he makes a statement Wednesday, Dec. 19, 2012, in the Brady Press Briefing Room at the White House in Washington, about policies he will pursue following the massacre at Sandy Hook Elementary School in Newtown, Ct. Obama is tasking Biden, a longtime gun control advocate, with spearheading the effort. (AP Photo/Charles Dharapak)

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Marriott CEO Arne Sorenson leaves the White House after a meeting of business leaders with President Obama and Vice President Joe Biden, in Washington, Wednesday, Nov. 28, 2012. (AP Photo/Jacquelyn Martin)

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**FILE** Holly Knowlton Petraeus holds the family bible as her husband, David Petraeus, is sworn in by Vice President Joe Biden as CIA Director on Sept. 6, 2011, in the Roosevelt Room of the White House in Washington. (Associated Press)

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Vice President Joe Biden (center) talks Sept., 6, 2011, with John Brennan (left), President Obama's chief counterterrorism adviser, and CIA director David Petraeus following a swearing-in ceremony in the Roosevelt Room of the White House in Washington. (Associated Press)

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President Obama, accompanied by Vice President Joe Biden, pauses for applause Nov. 9, 2012, in the East Room of the White House in Washington as he speaks about the economy and deficit. (Associated Press)

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President Obama, accompanied by Vice President Joe Biden and others, speaks Nov. 9, 2012, in the East Room of the White House in Washington about the economy and the deficit. (Associated Press)

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** FILE ** President Obama, accompanied by Vice President Joe Biden, speaks Nov. 9, 2012, in the East Room of the White House in Washington about the economy and the deficit. (Associated Press)

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President Obama, followed by Vice President Joe Biden, walks off stage Nov. 9, 2012, after speaking in the East Room of the White House in Washington about the economy and deficit. (Associated Press)

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This undated image released by NBC shows Vice President Joe Biden, left, with actress Amy Poeher, who plays Leslie Knope on the NBC comedy "Parks and Recreation," in Washington. Biden will appear on the NBC sitcom "Parks and Recreation" on Thursday, Nov. 15. (AP Photo/NBC, David Giesbrecht)

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**FILE** President Obama listens Feb. 20, 2009, as Vice President Joe Biden speaks in the East Room of the White House. (Associated Press)

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President Barack Obama , joined by his wife Michelle, Vice President Joe Biden and his spouse Jill acknowledge applause after Obama delivered his victory speech to supporters gathered in Chicago early Wednesday Nov. 7 2012. (AP Photo/Jerome Delay)

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President Barack Obama with first last Michelle Obama, Vice President Joe Biden and Jill Biden celebrate on stage at the election night party at McCormick Place, Wednesday, Nov. 7, 2012, in Chicago. Obama defeated Republican challenger former Massachusetts Gov. Mitt Romney.(AP Photo/Carolyn Kaster)

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President Barack Obama and wife Michelle is holds hands with Vice President Joe Biden and his wife Jill following Obama's victory speech to supporters in Chicago early Wednesday, Nov. 7 2012. (AP Photo/Jerome Delay)

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Vice President Joe Biden, accompanied by his wife Jill Biden, right, and granddaughter Natalie, meets with patrons during a visit to the Landmark Restaurant, Tuesday, Nov. 6, 2012, in Cleveland, Ohio. (AP Photo/Matt Rourke)