Seniority in the United States Senate

juniorseniorjunior senatorsenior senatorseniorityjunior United States Senatormost seniorseniority system4th longest-serving Senator5th most senior U.S. Senator
United States senators are conventionally ranked by the length of their tenure in the Senate.wikipedia
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Ben Cardin

Benjamin CardinBenjamin L. CardinCardin
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Benjamin Louis Cardin (born October 5, 1943) is an American politician serving as the senior United States Senator from Maryland, first elected to that seat in 2006.

Bernie Sanders

Bernard SandersSenator Bernie SandersSanders
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Bernard Sanders (born September8, 1941) is an American politician who has served as the junior United States Senator from Vermont since 2007.

Sherrod Brown

Brown, SherrodOhioSen Brown, Sherrod
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Sherrod Campbell Brown (, born November 9, 1952) is an American politician serving as the senior United States Senator from Ohio, a seat to which he was first elected in 2006.

Bob Casey Jr.

Bob Casey, Jr.Bob CaseyRobert Casey
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Robert Patrick Casey Jr. (born April 13, 1960) is an American attorney and politician serving as the senior United States Senator from Pennsylvania, a seat to which he was first elected in 2006.

Amy Klobuchar

KlobucharAmy Jean KlobucharAmy Klobuchar (D)
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Amy Jean Klobuchar (born May 25, 1960) is an American lawyer and politician serving as the senior United States Senator from Minnesota.

Jon Tester

Senator Jon TesterJohn TesterMontana
For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives.
Raymond Jon Tester (born August 21, 1956) is an American politician serving as the senior United States Senator from Montana, a seat he was first elected to in 2006.

President pro tempore of the United States Senate

President pro temporePresident pro tempore of the SenatePresident ''pro tempore'' of the Senate
Since 1890, the most senior U.S. senator in the majority party has generally been chosen to be president pro tempore and holds the office continuously until the election of another.

Chuck Grassley

Charles GrassleyCharles E. GrassleySenator Chuck Grassley
Charles Ernest Grassley (born September 17, 1933) is an American politician serving as the president pro tempore of the United States Senate, and the senior United States senator from Iowa.

Mitch McConnell

Senator Mitch McConnellMinority Leader Mitch McConnellMitch McConnel
Addison Mitchell McConnell Jr. (born February 20, 1942) is an American politician serving as Kentucky's senior United States senator and as Senate Majority Leader.

Richard Shelby

Richard C. ShelbyDick ShelbyRanking Member Shelby
Richard Craig Shelby (born May 6, 1934) is an American politician serving as the senior United States Senator from Alabama.

Dianne Feinstein

FeinsteinSenator Dianne FeinsteinU.S. Senator Dianne Feinstein
Dianne Goldman Berman Feinstein (born Dianne Emiel Goldman, June 22, 1933) is an American politician serving as the senior United States Senator from California.

Patty Murray

Senator Patty MurrayMurrayPatricia Murray
Patricia Lynn Murray (born Patricia Johns; October 11, 1950) is an American politician serving as the senior United States Senator from Washington, a seat she was first elected to in 1992.

Jim Inhofe

James InhofeJames M. InhofeInhofe
James Mountain Inhofe (born November 17, 1934) is an American politician serving as the senior United States Senator from Oklahoma, a seat he was first elected to in 1994.

Ron Wyden

Senator Ron WydenWydenSenator Ron Wyden (D-OR)
Ronald Lee Wyden (born May 3, 1949) is the senior United States Senator for Oregon since 1996.

Pat Roberts

Charles P. RobertsRoberts, PatSenator Pat Roberts
Charles Patrick Roberts (born April 20, 1936) is an American politician of the Republican Party serving as the senior United States Senator from Kansas, a position he has held since 1997.

Dick Durbin

Richard DurbinRichard J. DurbinSenator Dick Durbin
Richard Joseph Durbin (born November 21, 1944) is an American attorney and politician serving as the senior United States Senator from Illinois, a seat he was first elected to in 1996.

Jack Reed (Rhode Island politician)

Jack ReedJack Reed (politician)J. Reed
John Francis Reed (born November 12, 1949) is an American politician serving as the senior United States Senator from Rhode Island, a seat he was first elected to in 1996.

Susan Collins

Susan M. CollinsS. CollinsCollins, Susan
Susan Margaret Collins (born December 7, 1952) is an American politician serving as the senior United States Senator for Maine.

Mike Enzi

Michael EnziMichael B. Enzi2015
Michael Bradley Enzi (born February 1, 1944) is an American politician and accountant serving as the senior United States Senator from Wyoming, a seat he was first elected to in 1996.

Chuck Schumer

Charles SchumerCharles E. SchumerSchumer
Charles Ellis Schumer (born November 23, 1950) is an American politician serving as the senior United States Senator from New York, a seat to which he was first elected in 1998.

United States Senate

U.S. SenatorUnited States SenatorU.S. Senate
United States senators are conventionally ranked by the length of their tenure in the Senate.
In the 116th Congress, the most-senior "junior senator" is Maria Cantwell of Washington, who was sworn in on January 3, 2001, and is currently 18th in seniority, behind Patty Murray who was sworn in on January 3, 1993, and is currently 6th in seniority.

Mike Crapo

Michael CrapoMichael D. CrapoSenator Mike Crapo
Michael Dean Crapo (born May 20, 1951) is an American politician serving as the senior United States senator from Idaho, a seat he was first elected to in 1998.

Tom Carper

Thomas R. CarperThomas CarperSenator Tom Carper (D-DE)
Thomas Richard Carper (born January 23, 1947) is an American politician serving as the senior United States Senator from Delaware, serving since 2001.

Debbie Stabenow

StabenowStabenow, DebbieDebbie Ann Stabenow
Deborah Ann Greer Stabenow (born April 29, 1950) is an American politician who is the senior United States Senator from Michigan.