Joseph R. Biden

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Vice President Joseph R. Biden arrives at Har Zion Temple in Penn Valley, Pa., on Tuesday to attend the funeral of former Sen. Arlen Specter of Pennsylvania. (Associated Press)

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The corner for President Obama's campaign is seen Oct. 11, 2012, in the spin room of the media center at Centre College in Danville, Ky., ahead of the debate between Vice President Joseph R. Biden and Republican vice presidential candidate Paul Ryan. (Associated Press)

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Vice President Joseph R. Biden (left), followed by his daughter Ashley and son Beau, exit Air Force Two on Oct. 11, 2012, upon their arrival at Lexington Blue Grass Airport in Lexington, Ky., for the vice presidential debate. (Associated Press)

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** FILE ** Vice President Joseph R. Biden walks out of Air Force Two upon his arrival on Oct. 11, 2012, at Blue Grass Airport in Lexington, Ky., for the vice presidential debate. (Associated Press)

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**FILE** Vice President Joseph R. Biden speaks Oct. 2, 2012, in Asheville, N.C. (Associated Press)

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Calls were made to Vice President Joseph R. Biden’s office about an energy deal seeking political support. (Associated Press)

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Calls were made to Vice President Joseph R. Biden’s office about an energy deal seeking political support. (Associated Press)

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Students posing as Vice President Joseph R. Biden and Republican rival Rep. Paul Ryan shake hands Wednesday during setup for Thursday night’s vice presidential debate at Centre College in Danville, Ky. (Associated Press)

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Vice President Joseph R. Biden speaks Oct. 4, 2012, in Council Bluffs, Iowa. (Associated Press)

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** FILE ** Air Force Two touches down as Vice President Joseph R. Biden and his wife, Jill, arrive in Charlotte, N.C., on Tuesday, Sept. 4, 2012, for the Democratic National Convention. (AP Photo/Gerry Broome)

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Vice President Joseph R. Biden visits with a patron over lunch at Cruisers Diner in Seaman, Ohio. Politicians have always tried to connect with voters, but the 2012 candidates are putting their all into the campaign cliche of pressing the flesh. (Associated Press)

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Vice President Joseph R. Biden (center) and Interior Secretary Kenneth L. Salazar arrive for a memorial service at the Flight 93 National Memorial in Shanksville, Pa., on Tuesday, passing the Wall of Names bearing the names of the 40 passengers and crew members aboard Flight 93 who died when it was hijacked and crashed on Sept. 11, 2001. (Associated Press)