- Source: 2018 United States Senate election in Montana
The 2018 United States Senate election in Montana was held on November 6, 2018, to elect a member of the United States Senate to represent the State of Montana, concurrently with other elections to the United States Senate, elections to the United States House of Representatives and various state and local elections.
This was one of ten Democratic-held Senate seats up for election in a state that Donald Trump won in the 2016 presidential election. Incumbent Democratic Senator Jon Tester was reelected to a third term, defeating Republican State Auditor Matt Rosendale. Rosendale conceded on November 7, 2018. This was the first Senate election in which Tester received a majority of votes cast rather than a simple plurality. As of 2024, this remains the last time Democrats won any statewide election in Montana.
Following his loss, Rosendale went on to run for Montana's vacant congressional seat in 2020 and won, taking office in the U.S. House of Representatives in January 2021.
Democratic primary
= Candidates
=Nominated
Jon Tester, incumbent U.S. Senator
= Endorsements
== Results
=Republican primary
= Candidates
=Nominated
Matt Rosendale, Auditor of Montana and candidate for Congress in 2014
Eliminated in primary
Troy Downing, veteran and businessman
Russell Fagg, former Yellowstone County District Judge
Albert Olszewski, state senator and candidate for lieutenant governor in 2012
Withdrew
Ron Murray, businessman and candidate for the state house in 2010
Declined
Tim Fox, Attorney General of Montana
Robert J. O'Neill, former Navy SEAL (endorsed Troy Downing)
Marc Racicot, former governor and former chairman of the Republican National Committee (endorsed Russell Fagg)
Corey Stapleton, Secretary of State of Montana, candidate for governor in 2012 and candidate for Congress in 2014
Ryan Zinke, former Secretary of the Interior and former U.S. Representative
= Endorsements
== Polling
== Results
=Libertarian primary
= Candidates
=Nominated
Rick Breckenridge, 2016 candidate for the U.S. House of Representatives
In October 2018, Breckenridge told a reporter from the Associated Press that he opposed the use of dark money in politics. Breckenridge said that he realistically anticipated only receiving three or four percent of the vote in the general election, and that he endorsed Rosendale's efforts to stop the use of dark money in politics. The Associated Press interpreted Breckenridge's comments as a statement that Breckenridge was dropping out of the race and endorsing Rosendale. Breckenridge later stated that his use of the word "endorse" referred only to stopping the use of dark money in politics, and said he was still running for the Senate.
Green Party
Kelly won the Green Party nomination, but a Montana district court judge ruled that he had insufficient signatures to get on the ballot.
= Candidates
=Nominee (removed from ballot)
Steve Kelly, artist and environmental activist
Eliminated in primary
Timothy Adams
= Results
=General election
= Debates
=Complete video of debate, C-SPAN September 29, 2018
Complete video of debate, YouTube October 14, 2018
= Predictions
== Endorsements
== Fundraising
== Polling
== Results
=By county
From Secretary of State of Montana
Counties that flipped from Democratic to Republican
Chouteau (largest municipality: Fort Benton)
Rosebud (largest municipality: Colstrip)
Yellowstone (largest municipality: Billings)
References
External links
Candidates at Vote Smart
Candidates at Ballotpedia
Campaign finance at FEC
Campaign finance at OpenSecrets
Official campaign websites
Matt Rosendale (R) for Senate
Jon Tester (D) for Senate
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- 2018 United States Senate election in Montana
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