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Several rating systems place U.S. Sen. Tammy Baldwin, D-Wis., among the most liberal members of the Senate.

Baldwin is the sixth most liberal senator in the current Senate, according to Voteview, a roll call vote database maintained by UCLA’s Political Science Department. Its rankings are widely used by political scientists.

Americans for Democratic Action, which describes itself as a home for liberal activists, gave Baldwin a 100% rating for votes that senators took in 2021.

Heritage Action for America, a sister organization of the conservative Heritage Foundation think tank, gives Baldwin a lifetime score of 5% for how conservative she is.

The news website FiveThirtyEight said that Baldwin votes with President Joe Biden 95.5% of the time.

Some rankings put Baldwin as less liberal., which tracks Congress, ranks her 76 out of 100 for the “most politically right” senator.

Baldwin plans to run for re-election in 2024.

This Fact Brief is responsive to conversations such as this one.


Voteview 118th Congress (2023-2025) > Senators

Milwaukee Journal Sentinel The Senate’s oddest of ‘odd couples’: In Tammy Baldwin and Ron Johnson, Wisconsin has produced a historically divergent pairing

Americans for Democratic Action 2021 Congressional Voting Record

Heritage Action For America Sen. Tammy Baldwin – Scorecard 118: %

Govtrack 2022 Report Cards

FiveThirtyEight Does Your Member Of Congress Vote With Or Against Biden?

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Tom Kertscher / Wisconsin WatchFact Checker

Tom Kertscher joined as a Wisconsin Watch fact checker in January 2023 and contributes to our collaboration with the The Gigafact Project to fight misinformation online. Kertscher is a former longtime newspaper reporter, including at the Milwaukee Journal Sentinel, who has worked as a self-employed journalist since 2019. His gigs include contributing writer for PolitiFact and sports freelancer for The Associated Press.