| Co-Chair Year | Senator Name and State |
| 1963 | Senator John Sherman Cooper of Kentucky |
| | Senator Claiborne Pell of Rhode Island |
| | |
| 1964 | Senator Carl T. Curtis of Nebraska |
| | Senator Howard W. Cannon of Nevada |
| | |
| 1965 | Senator Len B. Jordan of Idaho |
| | Senator Stuart Symington of Missouri |
| | |
| 1966 | Senator Howard W. Cannon of Nevada |
| | Senator Hugh L. Scott of Pennsylvania |
| | |
| 1967 | Senator Howard W. Cannon of Nevada |
| | Senator Hiram L. Fong of Hawaii |
| | |
| 1968 | Senator Gale W. McGee of Wyoming |
| | Senator Mark O. Hatfield of Oregon |
| | |
| 1969 | Senator Henry M. Jackson of Washington |
| | Senator Edward W. Brooke of Massachusetts |
| | |
| 1970 | Senator Walter F. Mondale of Minnesota |
| | Senator Howard H. Baker, Jr. of Tennessee |
| | |
| 1971 | Senator Walter F. Mondale of Minnesota |
| | Senator Howard H. Baker, Jr. of Tennessee |
| | |
| 1972 | Senator Claiborne Pell of Rhode Island |
| | Senator John Sherman Cooper of Kentucky |
| | |
| 1973 | Senator Philip A. Hart of Michigan |
| | Senator Marlow W. Cook of Kentucky |
| | |
| 1974 | Senator Hubert H. Humphrey of Minnesota |
| |
Senator Lowell P. Weicker, Jr. of Connecticut |
| | |
| 1975 | Senator Henry M. Jackson of Washington |
| |
Senator Charles H. Percy of Illinois |
| | |
| 1976 | Senator Alan Cranston of California |
| |
Senator Jacob K. Javits of New York |
| | |
| 1977 | Senator Russel B. Long of Louisiana |
| |
Senator Clifford P. Hansen of Wyoming |
| | |
| 1978 | Senator George McGovern of South Dakota |
| |
Senator Robert W. Packwood of Oregon |
| | |
| 1979 | Senator Lloyd Bentsen of Texas |
| |
Senator Richard S. Schweiker of Pennsylvania |
| | |
| 1980 | Senator Sam Nunn of Georgia |
| |
Senator Mark O. Hatfield of Oregon |
| | |
| 1981 | Senator Nancy L. Kassebaum of Kansas |
| |
Senator Spark M. Matsunaga of Hawaii |
| | |
| | |
| 1982 | Senator Howard H. Baker, Jr. of Tennessee |
| |
Senator Alan Cranston of California |
| | |
| 1983 | Senator Paul D. Laxalt of Nevada |
| |
Senator John Glenn of Ohio |
| | |
| 1984 | Senator Bob Dole of Kansas |
| |
Senator Bill Bradley of New Jersey |
| | |
| 1985 | Senator Richard G. Lugar of Indiana |
| |
Senator Dale Bumpers of Arkansas |
| | |
| 1986 | Senator Alan K. Simpson of Wyoming |
| |
Senator David L. Boren of Oklahoma |
| | |
| 1987 | Senator Robert C. Byrd of West Virginia |
| |
Senator Bob Dole of Kansas |
| | |
| 1988 | Senator Terry Sanford of North Carolina |
| |
Senator Pete V. Domenici of New Mexico |
| | |
| 1989 | Senator Wendell H. Ford of Kentucky |
| |
Senator John Warner of Virginia |
| | |
| 1990 | Senator Albert Gore, Jr. of Tennessee |
| |
Senator Richard G. Lugar of Indiana |
| | |
| 1991 | Washington Week was cancelled due to the Gulf War |
| | |
| 1992 |
Senator Christopher J. Dodd of Connecticut |
| |
Senator Thad Cochran of Mississippi |
| | |
| 1993 | Senator John B. Breaux of Louisiana |
| |
Senator Pete V. Domenici of New Mexico |
| | |
| 1994 | Senator David Pryor of Arkansas |
| |
Senator Frank Murkowski of Alaska |
| | |
| 1995 | Senator Alan K. Simpson of Wyoming |
| |
Senator Carol Moseley-Braun of Illinois |
| | |
| 1996 | Senator Spencer Abraham of Michigan |
| |
Senator John F. Kerry of Massachusetts |
| | |
| 1997 | Senator Kay Bailey Hutchison of Texas |
| |
Senator Ron Wyden of Oregon |
| | |
| 1998 | Senator Susan M. Collins of Maine |
| |
Senator Jack Reed of Rhode Island |
| | |
| 1999 | Senator Richard G. Lugar of Indiana |
| |
Senator Kent Conrad of North Dakota |
| | |
| 2000 | Senator Craig Thomas of Wyoming |
| |
Senator Blanche Lambert Lincoln |
| | |
| 2001 | Senator Chuck Hagel of Nebraska |
| |
Senator Daniel K. Inouye of Hawaii |
| | |
| 2002 | Senator John B. Breaux of Louisiana |
| |
Senator Susan M. Collins of Maine |
| | |
| 2003 | Senator John Ensign of Nevada |
| |
Senator Patrick J. Leahy of Vermont |
| | |
| 2004 | Senator Richard G. Lugar of Indiana |
| |
Senator Jeff Bingaman of New Mexico |
| | |
| 2005 | Senator Kay Bailey Hutchison of Texas |
| |
Senator Daniel K. Akaka of Hawaii |
| | |
| 2006 | Senator Trent Lott of Mississippi |
| |
Senator Paul S. Sarbanes of Maryland |
| | |
| 2007 | Senator Barack Obama of Illinois |
| |
Senator Susan M. Collins of Maine |
| | |
| 2008 | Senator Dianne Feinstein of California |
| |
Senator Pat Roberts of Kansas |
