Joe Biden

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President Barack Obama, accompanied by Vice President Joe Biden, pauses as he speaks to media before a meeting with mayors and newly-elected mayors from across the country, Friday, Dec. 13, 2013, in the Roosevelt Room of the White House to discuss job creation and ensuring middle class families have a pathway to opportunity. (AP Photo/Carolyn Kaster)

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President Barack Obama, accompanied by Vice President Joe Biden, gestures as she speaks to media before a meeting with newly-elected mayors from across the country, Friday, Dec. 13, 2013, in the Roosevelt Room of the White House in Washington, to discuss job creation and ensuring middle class families have a pathway to opportunity. (AP Photo/Carolyn Kaster)

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Vice President Joe Biden speaks during a national memorial service for former South African President Nelson Mandela at the Washington National Cathedral, Washington, D.C., Wednesday, December 11, 2013. (Andrew Harnik/The Washington Times)

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Vice President Joe Biden leaves the podium after speaking during a national memorial service for former South African President Nelson Mandela at the Washington National Cathedral, Washington, D.C., Wednesday, December 11, 2013. (Andrew Harnik/The Washington Times)

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Washington, D.C. Mayor Vincent Gray, top left, watches from the audience as United States Vice President Joe Biden, second from right, leaves the podium after speaking during a national memorial service for former South African President Nelson Mandela at the Washington National Cathedral, Washington, D.C., Wednesday, December 11, 2013. (Andrew Harnik/The Washington Times)