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Class I


Class I - Senators Whose Term of Service Expire in 2019

Class I terms run from the beginning of the 113th Congress on January 3, 2013, to the end of the 115th Congress on January 3, 2019. Senators in Class I were elected to office in the November 2012 general election, unless they took their seat through appointment or special election.

Democrats
Baldwin, Tammy (D-WI)
Brown, Sherrod (D-OH)
Cantwell, Maria (D-WA)
Cardin, Benjamin L. (D-MD)
Carper, Thomas R. (D-DE)
Casey, Robert P., Jr. (D-PA)
Donnelly, Joe (D-IN)
Feinstein, Dianne (D-CA)
Gillibrand, Kirsten E. (D-NY)
Heinrich, Martin (D-NM)
Heitkamp, Heidi (D-ND)
Hirono, Mazie K. (D-HI)
Kaine, Tim (D-VA)
Klobuchar, Amy (D-MN)
Manchin, Joe, III (D-WV)
McCaskill, Claire (D-MO)
Menendez, Robert (D-NJ)
Murphy, Christopher (D-CT)
Nelson, Bill (D-FL)
Stabenow, Debbie (D-MI)
Tester, Jon (D-MT)
Warren, Elizabeth (D-MA)
Whitehouse, Sheldon (D-RI)
Republicans
Barrasso, John (R-WY)
Corker, Bob (R-TN)
Cruz, Ted (R-TX)
Fischer, Deb (R-NE)
Flake, Jeff (R-AZ)
Hatch, Orrin G. (R-UT)
Heller, Dean (R-NV)
Wicker, Roger F. (R-MS)

Independents
King, Angus S., Jr. (I-ME)
Sanders, Bernard (I-VT)

Article I, section 3 of the U.S. Constitution mandates the Senate's class structure.

Amendment XVII (1913) provides for direct election of Senators.