The 2018 United States Senate election in Missouri took place on November 6, 2018, to elect a member of the United States Senate to represent the State of Missouri, concurrently with other elections to the United States Senate, elections to the United States House of Representatives, and various state and local elections, including Missouri's quadrennial State Auditor election.
Incumbent Democratic Senator Claire McCaskill ran for re-election to a third term. McCaskill easily won her party's nomination, defeating several minor candidates in the primary, while Missouri Attorney General Josh Hawley comfortably won the Republican primary.[2]
The candidate filing deadline was March 27, 2018, and the primary election was held on August 7, 2018.[3] Pollsters predicted a tight race, however Hawley defeated McCaskill on election day by 5.8%, taking 51.4% of the vote to McCaskill's 45.6%, a somewhat larger margin than expected. This resulted in Republicans holding both Senate seats in Missouri for the first time since McCaskill took office in 2007. Hawley was also the youngest incumbent senator at that time and continued to be until the inauguration of Jon Ossoff in 2021.[4]
^2018 Voter Turnout Report(PDF), Missouri Secretary of State, December 7, 2018
^Wise, Lindsay (October 17, 2017). "GOP's top Senate recruit in Missouri won't commit to voting for McConnell as leader". McClatchy. Retrieved July 29, 2018.
^"United States Senate election in Missouri, 2018 - Ballotpedia". Retrieved March 3, 2017.
^"Missouri Election Results". The New York Times. November 11, 2018. Retrieved November 11, 2018.
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