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List of all 33 United States Senate seats (Class I) up for election in 2018

Arizona

Jeff Flake is a Republican
Jeff Flake (Republican)
• First sworn into office on January 3rd, 2013
• Age 54 and currently serving his first term
• He is eligible in 2018 but not announced
California

Dianne Feinstein is a Democrat
Dianne Feinstein (Democrat)
• First sworn into office on November 10th, 1992
• Age 84 and currently serving her fourth term
• She is eligible in 2018 and intends to run
Connecticut

Chris Murphy is a Democrat
Chris Murphy (Democrat)
• First sworn into office on January 3rd, 2013
• Age 44 and currently serving his first term
• He is eligible in 2018 and intends to run
Delaware

Tom Carper is a Democrat
Tom Carper (Democrat)
• First sworn into office on January 3rd, 2001
• Age 70 and currently serving his third term
• He is eligible in 2018 but not announced
Florida

Bill Nelson is a Democrat
Bill Nelson (Democrat)
• First sworn into office on January 3rd, 2001
• Age 74 and currently serving his third term
• He is eligible in 2018 and intends to run
Hawaii

Mazie Hirono is a Democrat
Mazie Hirono (Democrat)
• First sworn into office on January 3rd, 2013
• Age 69 and currently serving her first term
• She is eligible in 2018 and intends to run
Indiana

Joe Donnelly is a Democrat
Joe Donnelly (Democrat)
• First sworn into office on January 3rd, 2013
• Age 61 and currently serving his first term
• He is eligible in 2018 and intends to run
Maine

Angus King is a Independent
Angus King (Independent)
• First sworn into office on January 3rd, 2013
• Age 73 and currently serving his first term
• He is eligible in 2018 and intends to run
Maryland

Ben Cardin is a Democrat
Ben Cardin (Democrat)
• First sworn into office on January 3rd, 2007
• Age 73 and currently serving his second term
• He is eligible in 2018 and intends to run
Massachusetts

Elizabeth Warren is a Democrat
Elizabeth Warren (Democrat)
• First sworn into office on January 3rd, 2013
• Age 68 and currently serving her first term
• She is eligible in 2018 and intends to run
Michigan

Debbie Stabenow is a Democrat
Debbie Stabenow (Democrat)
• First sworn into office on January 3rd, 2001
• Age 67 and currently serving her third term
• She is eligible in 2018 and intends to run
Minnesota

Amy Klobuchar is a Democrat
Amy Klobuchar (Democrat)
• First sworn into office on January 3rd, 2007
• Age 57 and currently serving her second term
• She is eligible in 2018 and intends to run
Mississippi

Roger Wicker is a Republican
Roger Wicker (Republican)
• First sworn into office on December 31st, 2007
• Age 66 and currently serving his second term
• He is eligible in 2018 and intends to run
Missouri

Claire McCaskill is a Democrat
Claire McCaskill (Democrat)
• First sworn into office on January 3rd, 2007
• Age 64 and currently serving her second term
• She is eligible in 2018 and intends to run
Montana

Jon Tester is a Democrat
Jon Tester (Democrat)
• First sworn into office on January 3rd, 2007
• Age 60 and currently serving his second term
• He is eligible in 2018 and intends to run
Nebraska

Deb Fischer is a Republican
Deb Fischer (Republican)
• First sworn into office on January 3rd, 2013
• Age 66 and currently serving her first term
• She is eligible in 2018 and intends to run
Nevada

Dean Heller is a Republican
Dean Heller (Republican)
• First sworn into office on May 9th, 2011
• Age 57 and currently serving his first term
• He is eligible in 2018 and intends to run
New Jersey

Bob Menendez is a Democrat
Bob Menendez (Democrat)
• First sworn into office on January 18th, 2006
• Age 63 and currently serving his second term
• He is eligible in 2018 and intends to run
New Mexico

Martin Heinrich is a Democrat
Martin Heinrich (Democrat)
• First sworn into office on January 3rd, 2013
• Age 45 and currently serving his first term
• He is eligible in 2018 and intends to run
New York

Kirsten Gillibrand is a Democrat
Kirsten Gillibrand (Democrat)
• First sworn into office on January 26th, 2009
• Age 50 and currently serving her second term
• She is eligible in 2018 and intends to run
North Dakota

Heidi Heitkamp is a Democrat
Heidi Heitkamp (Democrat)
• First sworn into office on January 3rd, 2013
• Age 61 and currently serving her first term
• She is eligible in 2018 and intends to run
Ohio

Sherrod Brown is a Democrat
Sherrod Brown (Democrat)
• First sworn into office on January 3rd, 2007
• Age 64 and currently serving his second term
• He is eligible in 2018 and intends to run
Pennsylvania

Bob Casey, Jr. is a Democrat
Bob Casey, Jr. (Democrat)
• First sworn into office on January 3rd, 2007
• Age 57 and currently serving his second term
• He is eligible in 2018 and intends to run
Rhode Island

Sheldon Whitehouse is a Democrat
Sheldon Whitehouse (Democrat)
• First sworn into office on January 3rd, 2007
• Age 61 and currently serving his second term
• He is eligible in 2018 and intends to run
Tennessee

Bob Corker is a Republican
Bob Corker (Republican)
• First sworn into office on January 3rd, 2007
• Age 64 and currently serving his second term
• He is eligible in 2018 and intends to run
Texas

Ted Cruz is a Republican
Ted Cruz (Republican)
• First sworn into office on January 3rd, 2013
• Age 46 and currently serving his first term
• He is eligible in 2018 and intends to run
Utah

Orrin Hatch is a Republican
Orrin Hatch (Republican)
• First sworn into office on January 3rd, 1977
• Age 83 and currently serving his seventh term
• He has announced his retirement in 2018
Vermont

Bernie Sanders is a Independent
Bernie Sanders (Independent)
• First sworn into office on January 3rd, 2007
• Age 75 and currently serving his second term
• He is eligible in 2018 but not announced
Virginia

Tim Kaine is a Democrat
Tim Kaine (Democrat)
• First sworn into office on January 3rd, 2013
• Age 59 and currently serving his first term
• He is eligible in 2018 and intends to run
Washington

Maria Cantwell is a Democrat
Maria Cantwell (Democrat)
• First sworn into office on January 3rd, 2001
• Age 58 and currently serving her third term
• She is eligible in 2018 and intends to run
West Virginia

Joe Manchin is a Democrat
Joe Manchin (Democrat)
• First sworn into office on November 15th, 2010
• Age 69 and currently serving his second term
• He is eligible in 2018 and intends to run
Wisconsin

Tammy Baldwin is a Democrat
Tammy Baldwin (Democrat)
• First sworn into office on January 3rd, 2013
• Age 55 and currently serving her first term
• She is eligible in 2018 but not announced
Wyoming

John Barrasso is a Republican
John Barrasso (Republican)
• First sworn into office on June 22nd, 2007
• Age 65 and currently serving his second term
• He is eligible in 2018 and intends to run