(R) | April 3, 1979 |- | | nowrap | Abner Mikva (D) | style="font-size:80%" | Resigned September 26, 1979, after being appointed judge of U.S. Court of Appeals | nowrap | John Porter (R) | January 22, 1980 |- | | nowrap | Dan Flood (D) | style="font-size:80%" | Resigned January 31, 1980 | nowrap | Ray Musto (D) | April 9, 1980 |- | | nowrap | Dave Treen (R) | style="font-size:80%" | Resigned March 10, 1980, after being elected Governor of Louisiana | nowrap | Billy Tauzin (D) | May 22, 1980 |- | | nowrap | John M. Slack Jr. (D) | style="font-size:80%" | Died March 17, 1980 | nowrap | John G. Hutchinson (D) | June 30, 1980 |- | | nowrap | Charles Diggs (D) | style="font-size:80%" | Resigned June 3, 1980 | nowrap | George Crockett Jr. (D) | November 4, 1980 |- | | nowrap | Harold L. Runnels (D) | style="font-size:80%" | Died August 5, 1980 | rowspan=4 |Vacant | rowspan=4 |Not filled this term |- | | nowrap | Michael Myers (D) | style="font-size:80%" | Expelled October 2, 1980 |- | | nowrap | John Jenrette (D) | style="font-size:80%" | Resigned December 10, 1980 |- | | nowrap | Frank Thompson (D) | style="font-size:80%" | Resigned December 29, 1980, after being censured by the House of Representatives |} Committees Senate Aging (Special) (Chair: Lawton Chiles) Agriculture, Nutrition and Forestry (Chair: Herman Talmadge; Ranking Member: Jesse Helms) Agricultural Research and General Legislation (Chair: Donald Stewart; Ranking Member: Richard G. Lugar) Rural Development (Chair: Patrick Leahy; Ranking Member: Rudy Boschwitz) Foreign Agricultural Policy (Chair: Richard Stone; Ranking Member: Thad Cochran) Nutrition (Chair: George McGovern; Ranking Member: Bob Dole) Environment, Soil Conservation and Forestry (Chair: John Melcher; Ranking Member: Roger W. Jepsen) Agricultural Credit and Rural Electrification (Chair: Edward Zorinsky; Ranking Member: S.I. Hayakawa) Agricultural Production, Marketing and Stabilization of Prices (Chair: Walter "Dee" Huddleston; Ranking Member: Milton Young) Appropriations (Chair: Warren Magnuson; Ranking Member: Milton Young) Agriculture and Related Agencies (Chair: Thomas Eagleton; Ranking Member: Thomas F. Eagleton) Defense (Chair: John C. Stennis; Ranking Member: Milton Young) District of Columbia (Chair: Patrick Leahy; Ranking Member: Charles Mathias) Foreign Operations (Chair: Daniel Inouye; Ranking Member: Jake Garn) HUD-Independent Agencies (Chair: William Proxmire; Ranking Member: Charles Mathias) Interior (Chair: Robert Byrd; Ranking Member: Ted Stevens) Labor-Health, Education and Welfare (Chair: Warren Magnuson; Ranking Member: