Michael Bennet (D-CO)
Cory Booker (D-NJ)
Maria Cantwell (D-WA)
Thomas R. Carper (D-DE)
Bob Casey, Jr (D-PA)
Chris Coons (D-DE)
Joe Donnelly (D-IN)
Martin Heinrich (D-NM)
Hedi Heitkamp (D-ND)
Robert Menendez (D-NJ)
Patty Murray (D-WA)
Jon Tester (D-MT)
Mark Warner (D-VA)