Joseph R. Biden

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** FILE ** Vice President Joseph R. Biden walks through the Cerro Castillo palace gardens on his way to having lunch with Chile's newly sworn-in President Michelle Bachelet, in Vina del Mar, Chile, Tuesday, March 11, 2014. (AP Photo/Luis Hidalgo)

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President Obama and Vice President Joseph R. Biden exercise at the White House as part of First Lady Michelle Obama's "Let's Move!" campaign.

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Vice President Joseph R. Biden speaks at the Association of State Democratic Chairs meeting in Washington, Thursday, Feb. 27, 2014. (AP Photo/Susan Walsh)

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Vice President Joseph R. Biden tried to reassure Nancy Pelosi, California Democrat, about fast-track trade authority in an election year. "Nancy, I know it's not coming up now," he said. The minority leader told a steelworkers rally last week that trade promotion authority is out of the question. (Associated Press)

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Vice President Joseph R. Biden

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**FILE** Vice President Joseph R. Biden gets a hug from Rep. Jim Clyburn, South Carolina Democrat, during the dedication ceremony of the new Ernest F. Hollings Special Collections Library in Columbia, S.C., on July 23, 2010. (Associated Press)

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Vice President Joseph R. Biden and former Secretary of State Hillary Rodham Clinton will have a hard time cutting their ties to the Obama administration if they run for president in 2016. (Associated Press)

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** FILE ** In this Jan. 28, 2014, photo, Vice President Joseph R. Biden and House Speaker John Boehner of Ohio listens as President Barack Obama gives his State of the Union address on Capitol Hill in Washington. (AP Photo/Charles Dharapak)

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**FILE** Vice President Joseph R. Biden (left) stands with general manager John Berry as he looks over the cars at Bonneville & Son's dealership in Manchester, N.H., on May 25, 2011. (Associated Press)