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| Rank
|
Senator (party-state)
|
Seniority date
|
Other factors
|
| 1
|
Strom Thurmond (R-SC)
|
November 7, 1956
|
| 2
|
Robert Byrd (D-WV)
|
January 3, 1959
|
| 3
|
Claiborne Pell (D-RI)
|
January 3, 1961
|
| 4
|
Ted Kennedy (D-MA)
|
November 7, 1962
|
| 5
|
Daniel Inouye (D-HI)
|
January 3, 1963
|
| 6
|
Ernest Hollings (D-SC)
|
November 9, 1966
|
| 7
|
Mark Hatfield (R-OR)
|
January 10, 1967
|
| 8
|
Ted Stevens (R-AK)
|
December 24, 1968
|
| 9
|
Bob Dole (R-KS)
|
January 3, 1969
|
Former representative
|
| 10
|
Bob Packwood (R-OR)
|
| 11
|
Bill Roth (R-DE)
|
January 1, 1971
|
| 12
|
Sam Nunn (D-GA)
|
November 8, 1972
|
| 13
|
Bennett Johnston Jr. (D-LA)
|
November 14, 1972
|
| 14
|
Jesse Helms (R-NC)
|
January 3, 1973
|
North Carolina 12th in population (1970)
|
| 15
|
Pete Domenici (R-NM)
|
New Mexico 37th in population (1970)
|
| 16
|
Joe Biden (D-DE)
|
Delaware 46th in population (1970)
|
| 17
|
John Glenn (D-OH)
|
December 24, 1974
|
| 18
|
Wendell H. Ford (D-KY)
|
December 28, 1974
|
| 19
|
Dale Bumpers (D-AR)
|
January 3, 1975
|
Former governor
|
| 20
|
Patrick Leahy (D-VT)
|
| 21
|
John Danforth (R-MO)
|
December 27, 1976
|
| 22
|
Howard Metzenbaum (D-OH)
|
December 29, 1976
|
Previously a senator
|
| 23
|
John Chafee (R-RI)
|
| 24
|
Donald W. Riegle, Jr. (D-MI)
|
December 30, 1976
|
| 25
|
Paul Sarbanes (D-MD)
|
January 3, 1977
|
Former representative
|
| 26
|
Pat Moynihan (D-NY)
|
New York 2nd in population (1970)
|
| 27
|
Richard Lugar (R-IN)
|
Indiana 11th in population (1970)
|
| 28
|
Jim Sasser (D-TN)
|
Tennessee 17th in population (1970)
|
| 29
|
Dennis DeConcini (D-AZ)
|
Arizona 22nd in population (1970)
|
| 30
|
Orrin Hatch (R-UT)
|
Utah 36th in population (1970)
|
| 31
|
Malcolm Wallop (R-WY)
|
Wyoming 49th in population (1970)
|
| 32
|
David Durenberger (R-MN)
|
November 8, 1978
|
| 33
|
Max Baucus (D-MT)
|
December 15, 1978
|
| 34
|
Nancy Kassebaum Baker (R-KS)
|
December 23, 1978
|
| 35
|
Thad Cochran (R-MS)
|
December 27, 1978
|
| 36
|
Alan K. Simpson (R-WY)
|
January 1, 1979
|
| 37
|
John Warner (R-VA)
|
January 2, 1979
|
| 38
|
David Pryor (D-AR)
|
January 3, 1979
|
Former representative (6 years, 2 months)
|
| 39
|
William Cohen (R-ME)
|
Former representative (6 years)
|
| 40
|
Larry Pressler (R-SD)
|
Former representative (4 years)
|
| 41
|
David L. Boren[8] (D-OK)
|
Former governor – Oklahoma 27th in population (1970)
|
| 42
|
J. James Exon (D-NE)
|
Former governor – Nebraska 35th in population (1970)
|
| 43
|
Carl Levin (D-MI)
|
Michigan 7th in population (1970)
|
| 44
|
Bill Bradley (D-NJ)
|
New Jersey 8th in population (1970)
|
| 45
|
Howell Heflin (D-AL)
|
Alabama 21st in population (1970)
|
| 46
|
George J. Mitchell (D-ME)
|
May 17, 1980
|
| 47
|
Chris Dodd (D-CT)
|
January 3, 1981
|
Former representative (6 years) – Connecticut 24th in population
|
| 48
|
Chuck Grassley (R-IA)
|
Former representative (6 years) – Iowa 25th in population (1970)
|
| 49
|
Al D’Amato (R-NY)
|
New York 2nd in population (1970)
|
| 50
|
Arlen Specter (R-PA)
|
Pennsylvania 3rd in population (1970)
|
| 51
|
Don Nickles (R-OK)
|
Oklahoma 27th in population (1970)
|
| 52
|
Frank Murkowski (R-AK)
|
Alaska 50th in population (1970)
|
| 53
|
Frank Lautenberg[9] (D-NJ)
|
December 27, 1982
|
| 54
|
Jeff Bingaman (D-NM)
|
January 3, 1983
|
| 55
|
John Kerry (D-MA)
|
January 2, 1985
|
| 56
|
Paul Simon (D-IL)
|
January 3, 1985
|
Former representative (10 years) – Illinois 5th in population (1980)
|
| 57
|
Tom Harkin (D-IA)
|
Former representative (10 years) – Iowa 27th in population (1980)
|
| 58
|
Al Gore[10] (D-TN)
|
Former representative (8 years)
|
| 59
|
Phil Gramm (R-TX)
|
Former representative (6 years)
|
| 60
|
Mitch McConnell (R-KY)
|
|
| 61
|
Jay Rockefeller (D-WV)
|
January 15, 1985
|
| 62
|
John Breaux (D-LA)
|
January 3, 1987
|
Former representative (14 years)
|
| 63
|
Barbara Mikulski (D-MD)
|
Former representative (10 years)
|
| 64
|
Richard Shelby (D, R-AL[11])
|
Former representative (8 years) – Alabama 22nd in population (1980)
|
| 65
|
Tom Daschle (D-SD)
|
Former representative (8 years) – South Dakota 45th in population (1980)
|
| 66
|
John McCain (R-AZ)
|
Former representative (4 years) – Arizona 29th in population (1980)
|
| 67
|
Harry Reid (D-NV)
|
Former representative (4 years) – Nevada 43rd in population (1980)
|
| 68
|
Bob Graham (D-FL)
|
Former governor – Florida 7th in population (1980)
|
| 69
|
Kit Bond (R-MO)
|
Former governor – Missouri 15th in population (1980)
|
| 70
|
Kent Conrad (D-ND)
|
| 71
|
Slade Gorton (R-WA)
|
January 3, 1989
|
Previously a senator
|
| 72
|
Trent Lott (R-MS)
|
Former representative (16 years)
|
| 73
|
Jim Jeffords (R-VT)
|
Former representative (14 years)
|
| 76
|
Dan Coats (R-IN)
|
Former representative (8 years)
|
| 74
|
Connie Mack (R-FL)
|
Former representative (6 years)
|
| 75
|
Chuck Robb (D-VA)
|
Former governor – Virginia 14th in population (1980)
|
| 77
|
Richard Bryan (D-NV)
|
Former governor – Nevada 43rd in population (1980)
|
| 78
|
Bob Kerrey (D-NE)
|
Former governor – Nebraska 35th in population (1980)
|
| 79
|
Herb Kohl (D-WI)
|
Wisconsin 16th in population (1980)
|
| 80
|
Joe Lieberman (D-CT)
|
Connecticut 25th in population (1980)
|
| 81
|
Conrad Burns (R-MT)
|
Montana 44th in population (1980)
|
| 82
|
Daniel Akaka (D-HI)
|
May 16, 1990
|
| 83
|
Bob Smith (R-NH)
|
December 7, 1990
|
| 84
|
Hank Brown (R-CO)
|
January 3, 1991
|
Former representative (10 years)
|
| 85
|
Larry Craig (R-ID)
|
Former representative (6 years)
|
| 86
|
Paul Wellstone (D-MN)
|
| 87
|
Harris Wofford (D-PA)
|
May 9, 1991
|
| 88
|
Dianne Feinstein (D-CA)
|
November 10, 1992
|
| 89
|
Byron Dorgan (D-ND)
|
December 15, 1992
|
| 90
|
Barbara Boxer (D-CA)
|
January 3, 1993
|
Former representative (10 years)
|
| 91
|
Judd Gregg (R-NH)
|
Former representative (8 years)
|
| 92
|
Ben Nighthorse Campbell[12] (D-CO)
|
Former representative (6 years)
|
| 93
|
Bob Krueger[13] (D-TX)
|
Former representative (4 years)
|
| 94
|
Carol Moseley Braun (D-IL)
|
Illinois 6th in population (1990)
|
| 95
|
Lauch Faircloth (R-NC)
|
North Carolina 10th in population (1990)
|
| 96
|
Paul Coverdell (R-GA)
|
Georgia 11th in population (1990)
|
| 97
|
Russ Feingold (D-WI)
|
Wisconsin 16th in population (1990)
|
| 98
|
Patty Murray (D-WA)
|
Washington 18th in population (1990)
|
| 99
|
Bob Bennett (R-UT)
|
Utah 35th in population (1990)
|
| 100
|
Dirk Kempthorne (R-ID)
|
Idaho 42nd in population (1990)
|
| 101
|
Harlan Mathews (D-TN)
|
January 5, 1993
|
| 102
|
Kay Bailey Hutchison (R-TX)
|
June 14, 1993
|
| 103
|
Jim Inhofe (R-OK)
|
November 17, 1994
|
| 104
|
Fred Thompson (R-TN)
|
December 2, 1994
|
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