WASHINGTON, DC - FEBRUARY 6: U.S. Vice-President Joe Biden attends the National Prayer Breakfast at the Washington Hilton February 6, 2014 in Washington, DC. During Obama's sixth prayer breakfast, which has been held for 62 years, the president emphasized religious freedom. (Photo by Olivier Douliery-Pool/Getty Images)
WASHINGTON, DC - OCTOBER 07: US Vice President Joseph Biden listens to US President Barack Obama and German President Joachim Gauck speak during a meeting in the Oval Office at the White House October 7, 2015 in Washington, DC. The two leaders participated in a bi lateral meeting that marked theÊ25th anniversary of German reunification (Photo by Mark Wilson/Getty Images)
NEW YORK, NY - JULY 27: Vice President Joe Biden speaks at an event attended by New York Gov. Andrew Cuomo to unveil plans for new area infrastructure projects on July 27, 2015 in New York City. The highlight of the event was an announcement that a new LaGuardia airport will be built, with construction starting next year. The new facility will will feature state-of-the-art security, transportation and shopping and dining options. The project is estimated to bring 8,000 new jobs to the area. (Photo by Spencer Platt/Getty Images)
US Vice President Joe Biden gives two thumbs-up prior to US President Barack Obama delivering the State of the Union address before a joint session of Congress on January 28, 2014 at the US Capitol in Washington. AFP PHOTO/Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
CHATTANOOGA, TN - AUGUST 15: U.S. Vice President Joe Biden speaks at a memorial service to honor those killed In Chattanooga shooting at University of Tennessee at Chattanooga's McKenzie Arena on August 15, 2015 in Chattanooga, Tennessee. The military is putting on the ceremony to honor the sailor and four Marines killed and to say thank you to the men and women who helped responded when Mohammad Abdulazeez shot up a military recruitment center and a Navy operations support center before being killed by law enforcement, (Photo by Jason Davis/Getty Images)
