Joseph R. Biden

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Vice President Joseph R. Biden pats President Obama on the chest Thursday while he speaks at a reception in the East Room of the White House to celebrate Lesbian, Gay, Bisexual and Transgender Pride Month. (Associated Press)

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Vice President Joseph R. Biden stands with former Rhode Island Rep. Patrick Kennedy as he speaks at the closing of the National Conference on Mental Health on June 3, 2013, in the South Court Auditorium on the White House complex in Washington. The conference is part of the Obama Administration's effort to launch a national conversation to increase understanding and awareness of mental health. Kennedy was a participant of the conference and was unexpectedly brought up on stage by Biden. (Associated Press)

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U.S. Vice President Joseph R. Biden, front right, accompanied by Trinidad and Tobago's Prime Minister Kamla Persad-Bissessar, reacts to the sound of the steelpan band, the traditional percussion instrument of the Caribbean twin-island country, upon his arrival to the Diplomatic Center in St. Ann's, Trinidad, Tuesday, May 28, 2013. (AP Photo/Anthony Harris)

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According to the likely 2016 presidential matchups in a Public Policy Polling survey released Wednesday, Hillary Rodham Clinton leads among Democrats with 63 percent of the votes, well ahead of Vice President Joseph R. Biden at 13 percent and a couple of other Democrats in single digits.

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**FILE** Vice President Joseph R. Biden delivers remarks at the 43rd annual Washington Conference on the Americas at the State Department in Washington on May 8, 2013. (Associated Press)

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Vice President Joseph R. Biden speaks at Wednesday's memorial service for fallen MIT Officer Sean Collier, fatally shot during the manhunt for the Boston Marathon bombers. With bagpipes wailing, the line of mourners stretched for a half-mile.

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**FILE** Vice President Joseph R. Biden speaks about gun legislation on April 9, 2013, in the Eisenhower Executive Office Building at the White House in Washington. The Obama administration continued its efforts to pressure Republicans, with Mr. Biden and Attorney General Eric H. Holder Jr. speaking at the White House, joined by law enforcement officials. (Associated Press)

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**FILE** Vice President Joseph R. Biden speaks on a cell phone from a member of the audience at the Disabled American Veterans National Convention in Las Vegas on Aug. 4, 2012. (Associated Press/Las Vegas Review-Journal)