2020 United States House of Representatives election in Montana should not be confused with 2020 Montana House of Representatives election.
| Election Name: | 2020 United States House of Representatives election in Montana, at-large district |
| Country: | Montana |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 2018 United States House of Representatives election in Montana |
| Previous Year: | 2018 |
| Next Election: | 2022 United States House of Representatives elections in Montana |
| Next Year: | 2022 |
| Election Date: | November 3, 2020 |
| Party1: | Republican Party (United States) |
| Image1: | File:Matt Rosendale 117th U.S Congress (cropped).jpg |
| Nominee1: | Matt Rosendale |
| Popular Vote1: | 339,169 |
| Percentage1: | 56.39% |
| Party2: | Democratic Party (United States) |
| Nominee2: | Kathleen Williams |
| Popular Vote2: | 262,340 |
| Percentage2: | 43.61% |
| U.S. Representative | |
| Before Election: | Greg Gianforte |
| Before Party: | Republican Party (United States) |
| After Election: | Matt Rosendale |
| After Party: | Republican Party (United States) |
| Map Size: | 300px |
The 2020 United States House of Representatives election in Montana was held on November 3, 2020, to elect the U.S. representative from Montana's at-large congressional district. The election coincided 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, Republican Greg Gianforte, who was reelected with 50.9% of the vote in 2018,[1] declined to run for reelection and instead ran successfully for Governor of Montana, after having lost the 2016 election to incumbent Democrat Steve Bullock.
As the Green Party was removed from the ballot, this was the first time since 1988 that there were no non-Republican or Democratic candidates running for either United States House of Representatives or United States Senate in Montana.[2]
In the general election, Republican state auditor Matt Rosendale defeated former state representative Kathleen Williams.
As of a result of the 2020 redistricting cycle, Montana regained its 2nd congressional district that it lost in 1993, therefore making the 2020 election the last election for the at-large district before it was eliminated.
Polls with a sample size of <100 have their sample size entries marked in red to indicate a lack of reliability.
| Poll source | Date(s) administered | Sample size | Margin of error | Russell Fagg | Joe Dooling | Timothy Johnson | Al Olszewski | Denny Rehberg | Matt Rosendale | Corey Stapleton | Undecided | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Montana State University Billings | October 7–16, 2019 | 99 (LV) | – | – | 1% | <1% | – | – | 32% | 22% | 44% | ||
| WPA Intelligence (R) | February 24–26, 2019 | 501 (V) | ± 4.4% | 24% | – | – | – | – | 57% | – | 15% | ||
| – | – | 39% | 46% | – | 13% | ||||||||
| 18% | 10% | – | 51% | – | 18% | ||||||||
| 15% | – | 31% | 37% | – | 16% | ||||||||
| 17% | – | – | 48% | 19% | 16% |
Polls with a sample size of <100 have their sample size entries marked in red to indicate a lack of reliability.
| Source | Ranking | As of | |
|---|---|---|---|
| align=left | The Cook Political Report[17] | October 2, 2020 | |
| align=left | Inside Elections[18] | October 1, 2020 | |
| align=left | Sabato's Crystal Ball[19] | October 1, 2020 | |
| Politico[20] | September 9, 2020 | ||
| Daily Kos[21] | September 25, 2020 | ||
| RCP[22] | October 26, 2020 | ||
| Niskanen[23] | July 26, 2020 | ||
| The Economist[24] | October 2, 2020 |
| Poll source | Date(s) administered | Sample size | Margin of error | Matt Rosendale (R) | Kathleen Williams (D) | Other / Undecided | |
|---|---|---|---|---|---|---|---|
| Montana State University Billings | October 19–24, 2020 | 546 (LV) | ± 4.2% | 47% | 46% | 6% | |
| Siena College/NYT Upshot | October 18–20, 2020 | 758 (LV) | ± 4.4% | 50% | 46% | 4% | |
| Strategies 360 | October 15–20, 2020 | 500 (LV) | ± 4.4% | 46% | 46% | 9% | |
| RMG Research/PoliticalIQ | October 15–18, 2020 | 800 (LV) | ± 3.5% | 47% | 47% | 6% | |
| 45% | 49% | 6% | |||||
| 49% | 45% | 6% | |||||
| Montana State University Bozeman | September 14 – October 2, 2020 | 1,609 (LV) | ± 3.9% | 48% | 46% | 6% | |
| Siena College/NYT Upshot | September 14–16, 2020 | 625 (LV) | ± 4.8% | 41% | 44% | 13% | |
| Expedition Strategies (D) | August 22–27, 2020 | 400 (LV) | ± 4.9% | 48% | 51% | 1% | |
| WPA Intelligence (R) | August 9–11, 2020 | 500 (LV) | ± 4.4% | 51% | 45% | 4% | |
| Civiqs/Daily Kos | July 11–13, 2020 | 873 (RV) | ± 4.2% | 49% | 47% | 5% | |
| Public Policy Polling | July 9–10, 2020 | 1,224 (V) | ± 2.8% | 44% | 44% | 13% | |
| Global Strategy Group (D) | June 24–28, 2020 | 500 (LV) | ± 4.4% | 47% | 47% | 6% | |
| University of Montana | June 17–26, 2020 | 517 (RV) | ± 4.3% | 45% | 37% | 18% | |
| Public Policy Polling | March 12–13, 2020 | 903 (V) | ± 3.3% | 45% | 45% | 9% |
University of Montana polls did not account for certain presumed withdrawals of major party candidates after their primaries in the following polls.