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

Republicans

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)

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.

Class II

Senators in Class II were elected to office in the November 2014 general election, unless they took their seat through appointment or special election. Their terms run from the beginning of the 114th Congress on January 6, 2015 to the end of the 116th Congress on January 3, 2021.

Class III

Senators in Class III were elected to office in the November 2010 general election, unless they took their seat through appointment or special election. Their terms run from the beginning of the 112th Congress on January 3, 2011 to the end of the 114th Congress on January 3, 2017.

Biographical Directory

The Directory provides information about former and current senators.