During President Donald Trump’s (R) term, Republicans lost a net 187 state legislative seats. In 61 of the 99 state legislative chambers, the Democratic Party held more seats following the 2020 general election than it did after the general election in 2016.
Five chambers in four states flipped from Republican to Democratic control during the course of the Trump presidency: the Colorado State Senate, Maine State Senate, Minnesota House of Representatives, and both chambers in the Virginia General Assembly. In Colorado, Maine, and Virginia, these flips resulted in the creation of Democratic trifectas, where Democrats controlled both legislative chambers and the governorship. Republicans did not gain control of any chambers by the end of Trump’s presidency that they did not already control at its start.
Democrats saw positive margin changes in 34 states during Trump’s presidency, either by increasing an already-existing majority or narrowing/flipping a Republican majority. The largest shifts in Democrats’ favor came in Connecticut, Virginia, and Georgia. Republicans saw positive margin changes in 13 states. The largest shifts in Republicans’ favor came in Kentucky, West Virginia, and Louisiana. There were no shifts in Alaska or Nevada. Nebraska, which has a nonpartisan legislature, was excluded from this analysis.
Across all presidencies since 1921, the president’s party has lost a net average of 552 state legislative seats. Trump’s net loss of 187 Republican state legislative seats was the smallest loss of seats for the president’s party since Harry Truman’s (D) presidency, which saw a net loss of 138 Democratic seats. Two presidents—George H.W. Bush (R) and Ronald Reagan (R)—gained state legislative seats over the course of their presidencies. During the past century, the largest Republican losses occurred under the Herbert Hoover (R) administration with a net loss of 1,662 Republican seats from 1929 to 1933. The largest Democratic losses occurred under the Barack Obama (D) administration with a net loss of 948 Democratic seats from 2009 to 2017.
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