Joe Biden

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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)

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

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Vice President Joe Biden hugs a patron during a visit to the Landmark Restaurant, Tuesday, Nov. 6, 2012, in Cleveland, Ohio. Biden's daughter Ashley is at left. (AP Photo/Matt Rourke)

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Vice President Joe Biden meets with patrons during a visit to the Landmark Restaurant, Tuesday, Nov. 6, 2012, in Cleveland, Ohio. (AP Photo/Matt Rourke)

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John Mellencamp, center, performs before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)

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Supporters listen to John Mellencamp perform before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)

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Vice president Joe Biden gestures during campaign rally at The American Civil War Center at Historic Tredegar Ironworks, as Democratic Senate candidate Timothy Kaine, left, listens in Richmond, Va., Monday, Nov. 5, 2012. (AP Photo/Steve Helber)

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John Mellencamp performs before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)

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Supporters listen to John Mellencamp perform before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)