MAJORITY

• 2Jennings Randolph

  [D] WV, United States
• 4Edmund Muskie

  [D] ME, United States

  Ended 05/07/1980
• 22Maurice Gravel

  [D] AK, United States

  Ended 01/03/1981
• 323Lloyd Bentsen

  [D] TX, United States
• 28Quentin N. Burdick

  [D] ND, United States
• 7John C. Culver

  [D] IA, United States

  Ended 01/03/1981
• 90Gary Hart

  [D] CO, United States
• 726Daniel Patrick Moynihan

  [D] NY, United States

MINORITY

• 47Robert T. Stafford

  [R] VT, United States
• 29Howard H. Baker Jr.

  [R] TN, United States
• 1,594Pete V. Domenici

  [R] NM, United States
• 647John H. Chafee

  [R] RI, United States
• 703Alan K. Simpson

  [R] WY, United States
• 403Larry Pressler

  [R] SD, United States

OTHER

• 1,480George J. Mitchell

  [D] ME, United States

  Began 05/19/1980