Brendan McDonough (center right), the sole surviving member of the Granite Mountain Hotshots crew, hugs Harold A. Schaitberger, general president of the International Association of Firefighters, as Vice President Joseph R. Biden and Dan Bates, Prescott Chapter Vice President of United Yavapai Firefighters Association, Local 3066, look on during the "Our Fallen Brothers" memorial service for the 19 fallen firefighters at Tim's Toyota Center in Prescott Valley, Ariz., on Tuesday, July 9, 2013. (Associated Press/The Arizona Republic)
**FILE** From left: Senate Minority Leader Mitch McConnell, Kentucky Republican, Senate Majority Leader Harry Reid, Nevada Democrat, House Speaker John Boehner, Ohio Republican, and Vice President Joseph R. Biden participate in a ceremony on Capitol Hill in Washington on June 19, 2013. (Associated Press)
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)
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)
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)
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.