Joe Biden

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Vice President Joe Biden pauses as he speaks to media during a meeting with representatives of student groups, Tuesday, Feb. 18, 2014, in the Eisenhower Executive Office Building on the White House Complex in Washington, as part of the Campus Sexual Assault Task Force. At right is Jessica Bennett from University of Maryland in College Park, Md. (AP Photo/Carolyn Kaster)

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Vice President Joe Biden reacts to a comment by President Obama about his sunglasses, during a Democratic rally in Philadelphia, Sunday, Oct. 10, 2010. (AP Photo/J. Scott Applewhite)

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**FILE** Chile's President Michelle Bachelet, left, shakes hands with U.S. Vice President Joe Biden as they pose for pictures at the La Moneda presidential palace in Santiago, Saturday, Mar. 28, 2009. Biden is a one-day official visit to Chile. (AP Photo/Santiago Llanquin)

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Actress Julia Louis-Dreyfus, right, smiles as he takes her seat next to Vice President Joe Biden, left, at a State Dinner for French President Francois Hollande, Tuesday, Feb. 11, 2014, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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Sen. John Walsh, D-Mont., left, accompanied by his wife Janet, shakes hands with Vice President Joe Biden after a ceremonial swearing-in ceremony to the U.S. Senate, Tuesday, Feb. 11, 2014, on Capitol Hill in Washington. (AP Photo/Lauren Victoria Burke)

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Vice President Joe Biden pays tribute to Joan Mondale whose urn sits on a table in front at her memorial service at Westminster Presbyterian Church, Saturday, Feb. 8, 2014 in Minneapolis. Joan Mondale, 83, died Feb. 3. At right is Vice President Joe Biden who also spoke. More than 1,000 were in attendance according to church officials. (AP Photo/Jim Mone)

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Vice President Joe Biden smiles as he listens to remarks at a news conference, Thursday, Feb. 6, 2014, at 30th Street Station in Philadelphia. Biden in his visit to the train station stressed the need for infrastructure investment. (AP Photo/Matt Rourke)

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Vice President Joe Biden tours Amtrak’s new Cities Sprinter electric locomotive, Thursday, Feb. 6, 2014, at 30th Street Station in Philadelphia. Biden in his visit to the train station stressed the need for infrastructure investment (AP Photo/Matt Rourke)