Claire McCaskill
NBC/MSNBC contributor, former US Senator from Missouri
Barack Obama
44th President of the United States
Angus King
US Senator from Maine (2013-present); former Governor of Maine
Shelley Berkley
Former US Representative from Nevada
Kirsten Gillibrand
US Senator and Representative from New York
Jerry Nadler
US Representative from New York (1991-present)
Joe Manchin
US Senator from West Virginia (2010-present)
Bill Nelson
Democrat US Senator and Representative from Florida; Biden nominee to head NASA
Bob Casey
US Senator from Pennsylvania (2007-present)
Bob Menendez
Democratic US Senator and Representative from New Jersey