WASHINGTON, DC - APRIL 13:  U.S. Vice President Joe Biden bows his head in humility before receiving the Green Jobs Champion Award during the Good Jobs Green Jobs National Conference at the Washington Hilton April 13, 2015 in Washington, DC. Sponsored by a varied coalition including lightweight metals producer Alcoa, the United Steelworks union, the Sierra Club and various other labor, industry and telecommunications leaders, the conference promotes the use of efficient and renewable energy and cooperation in updating the country's energy infrastructure.  (Photo by Chip Somodevilla/Getty Images)