Vice President Joe Biden and his wife Dr. Jill Biden talk with Rep. Steny Hoyer, D-Md. as they wait for former President Bill Clinton to address the Democratic National Convention at the Time Warner Arena in Charlotte, N.C., on Wednesday, September 5, 2012. (Barbara Salisbury/ The Washington Times)
Vice-President Joe Biden talks with First Lady Michelle Obama and her brother Craig Robinson at the Democratic National Convention at the Time Warner Arena in Charlotte, N.C., on Wednesday, September 5, 2012. (Barbara Salisbury/ The Washington Times)
Vice President Joe Biden speaks during a campaign stop at the United Auto Workers Local 1714 Union Hall, Friday, Aug. 31, 2012, in Lordstown, Ohio. (AP Photo/Mark Stahl)
Vice President Joe Biden gives two thumbs up Monday, Aug. 13, 2012, during a rally at the Durham Armory in Durham, N.C. (AP Photo/The News & Observer, Travis Long)
Vice President Joe Biden pays the George Washington High School football team a surprise visit on Monday, Aug. 13, 2014, in Danville, Va. (AP Photo/The Register & Bee, Steven Mantilla) ** FILE **
Vice President Joe Biden, in his Constitutional role as president of the Senate, arrives at the Capitol to provide the tie-breaking vote, if needed, on a vote to extend broad tax cuts that will otherwise expire in January, in Washington, Wednesday, July 25, 2012. (AP Photo/J. Scott Applewhite)
Vice President Joe Biden salutes after arriving to speak before the 2012 National Educational Association annual meeting, Tuesday, July 3, 2012, in Washington. (AP Photo/Evan Vucci)
Ashley Biden, daughter of Vice President Joe Biden and Jill Biden, and her new husband, Dr. Howard Krein, pose for a portrait at their wedding in Wilmington, Del., on Saturday, June 2, 2012. (AP Photo/The White House, David Lienemann)
Vice President Joe Biden responds to a question from Bob Schieffer, host of the CBS Sunday-morning program "Face the Nation," during an interview recorded on Thursday, March 29, 2012, in Milwaukee. (AP Photo/CBS News, Chris Usher)