U.S. Senate - composition by political party affiliation 1983-2023

Composition of the U.S. Senate by political party affiliation from 1983 to 2023

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Release date

January 2023


United States

Survey time period

1983 to 2023

Supplementary notes

Data are as of the beginning of each session, and reflect immediate results.
Release date is date of last access.

* Since 2003, all "other party" candidates have caucused with the Democratic Party.

** With the Senate evenly divided, Democratic Vice President Al Gore held the deciding vote from January 3 to 20, 2001. From then onwards, Republican Vice President Richard Cheney held the deciding vote, giving the majority to the Republicans.
In May 2001, the Senator from Vermont announced his switch from the Republican Party to Independent. As an Independent Senator, he caucused with the Democrats, changing the balance of power to the Democratic Party.

***The Senate was evenly divided once again in 2021, with Democratic Vice President Kamala Harris having the deciding vote in the case of a tie.

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