2020 United States House of Representatives election in Montana
The 2020 United States House of Representatives election in Montana will be held on November 3, 2020, to elect the U.S. Representative from Montana's at-large congressional district. The elections will coincide with the 2020 U.S. presidential election, as well as other elections to the House of Representatives, elections to the United States Senate and various state and local elections.
The incumbent is Republican Greg Gianforte, who was reelected with 50.9% of the vote in 2018. He is running for Governor of Montana a second time in the 2020 election after having lost the 2016 election to incumbent Democrat Steve Bullock, which means that the contest for the U.S. House of Representatives will be an open race.
Republican primary
Candidates
Declared
- Joe Dooling, rancher and chair of the Lewis and Clark County Republican Party
- John Evankovich, electrical contractor
- Debra Lamm, former chair of the Montana Republican Party and former state representative
- Mark McGinley, youth counselor and retired Montana National Guard veteran
- Matt Rosendale, Montana State Auditor, nominee for the U.S. Senate in 2018, candidate for Montana's at-large congressional district in 2014
- Corey Stapleton, Secretary of State of Montana, former state senator, candidate for Governor of Montana in 2012, candidate for the U.S. House in 2014
Declined
- Greg Gianforte, incumbent U.S. Representative
- Albert Olszewski, state senator
- Denny Rehberg, former U.S. Representative, nominee for U.S. Senate in 1996 and 2012, and former Lieutenant Governor of Montana
Endorsements
Polling
Polls with a sample size of <100 have their sample size entries marked in red to indicate a lack of reliability.| Poll source | Date administered | Sample size | Margin of error | Russell Fagg | Joe Dooling | Timothy Johnson | Al Olszewski | Denny Rehberg | Matt Rosendale | Corey Stapleton | Undecided |
| October 7–16, 2019 | 99 | – | – | 1% | <1% | – | – | 32% | 22% | 44% | |
| February 24–26, 2019 | 501 | ± 4.4% | 24% | – | – | – | – | 57% | – | 15% | |
| February 24–26, 2019 | 501 | ± 4.4% | – | – | – | – | 39% | 46% | – | 13% | |
| February 24–26, 2019 | 501 | ± 4.4% | 18% | – | – | 10% | – | 51% | – | 18% | |
| February 24–26, 2019 | 501 | ± 4.4% | 15% | – | – | – | 31% | 37% | – | 16% | |
| February 24–26, 2019 | 501 | ± 4.4% | 17% | – | – | – | – | 48% | 19% | 16% |
Results
Democratic primary
Candidates
Declared
- Kathleen Williams, former state representative and nominee for Montana's at-large congressional district in 2018
- Tom Winter, state representative
Withdrew
- Matt Rains, rancher and army veteran
Declined
- Wilmot Collins, mayor of Helena and former 2020 candidate for U.S. Senate
- Rob Quist, musician, member of the Montana Arts Council, nominee for Montana's at-large congressional district in 2017
Endorsements
Polling
Polls with a sample size of <100 have their sample size entries marked in red to indicate a lack of reliability.| Poll source | Date administered | Sample size | Margin of error | Matt Rains | Kathleen Williams | Undecided |
| October 7–16, 2019 | 40 | – | 6% | 69% | 25% |
Results
Other candidates
Green Party
Nominee
- John Gibney, anti-immigration activist
Results
General election
Predictions
Polling
University of Montana polls did not account for certain presumed withdrawals of major party candidates after their primaries in the following polls.;with Joe Dooling, John Evankovich, Timothy Johnson, Corey Stapleton and Tom Winter
| Poll source | Date administered | Sample size | Margin of error | Matt Rosendale | Corey Stapleton | Kathleen Williams | Other |
| February 12–22, 2020 | 498 | ± 4.4% | 35.7% | 19.4% | 35.8% | 9.1% |
;with Joe Dooling, Timothy Johnson, Matt Rains, Corey Stapleton and Tom Winter
| Poll source | Date administered | Sample size | Margin of error | Matt Rosendale | Corey Stapleton | Kathleen Williams | Other |
| September 26 – October 3, 2019 | 303 | ± 5.6% | 35.3% | 19.8% | 36.1% | 8.8% |