# 2018 United States House of Representatives election in Montana

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vte :
The 2018 United States House of Representatives election in Montana was held on November 6, 2018, to elect the U.S. representative from Montana's at-large congressional district. The election coincided with other elections to the House of Representatives, elections to the United States Senate, and various state and local elections.

## Republican primary
### Candidates
#### Declared

* Greg Gianforte, incumbent U.S. Representative

### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Greg Gianforte (incumbent) | 135,225 | 100 |
| Total votes | Total votes | Total votes | 135,225 | 100 |

## Democratic primary
### Candidates
#### Declared

* John Heenan, attorney
* Grant Kier, former executive director of the Five Valleys Land Trust
* Jared Pettinato, attorney
* Kathleen Williams, former state representative

#### Withdrew

* Lynda Moss, former state senator (but remained on the ballot)

### Primary results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Kathleen Williams | 37,158 | 33.5 |
| | Democratic | John Heenan | 35,163 | 31.7 |
| | Democratic | Grant Kier | 26,835 | 24.2 |
| | Democratic | Lynda Moss (withdrawn) | 5,592 | 5.0 |
| | Democratic | John Meyer | 3,695 | 3.3 |
| | Democratic | Jared Pettinato | 2,440 | 2.2 |
| Total votes | Total votes | Total votes | 110,883 | 100 |

## Libertarian primary
### Candidates
#### Declared

* Elinor Swanson, attorney

## General election
### Debates

* Complete video of debate, September 29, 2018
* Complete video of debate, October 6, 2018

### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Lean R | November 5, 2018 |
| Inside Elections/Rothenberg Political Report | Likely R | November 5, 2018 |
| Sabato's Crystal Ball | Lean R | November 5, 2018 |

### Endorsements

Federal politicians
* Donald Trump, 45th President of the United States
Organizations
* Montana Shooting Sports Association
* NRA Political Victory Fund
Federal politicians
* Jon Tester, U.S. Senator (D-MT)
Newspapers
* Billings Gazette
* Bozeman Daily Chronicle
* Missoulian
Labor unions
* American Federation of Government Employees District 11
* Montana AFL-CIO
* Montana Sportsmen Alliance
* Montana State Council of Professional Fire Fighters
Organizations
* EMILY's List
* End Citizens United
* Giffords PAC
* League of Conservation Voters Action Fund
* Montana Conservation Voters
* National Committee to Preserve Social Security and Medicare
* National Organization for Women PAC
* Planned Parenthood Action Fund

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Greg Gianforte (R) | Kathleen Williams (D) | Elinor Swanson (L) | Other | Undecided |
| Change Research (D) | November 2–4, 2018 | 879 | – | 52% | 44% | 2% | – | – |
| Gravis Marketing | October 24–26, 2018 | 782 | ± 3.5% | 48% | 48% | – | – | 3% |
| University of Montana | October 10–18, 2018 | 533 | ± 4.3% | 45% | 46% | 2% | – | 7% |
| Montana State University Billings | October 8–13, 2018 | 471 | ± 4.5% | 44% | 41% | 3% | – | 12% |
| Montana State University Bozeman | September 15 – October 6, 2018 | 2,079 | ± 2.2% | 48% | 40% | 2% | 1% | 9% |
| Gravis Marketing | September 19–22, 2018 | 710 | ± 3.7% | 51% | 42% | – | – | 8% |
| AARP/Benenson Strategy Group (D) | September 6–16, 2018 | 950 | ± 3.1% | 46% | 45% | – | 1% | 7% |
| University of Montana | August 13–31, 2018 | 466 | ± 4.5% | 38% | 51% | 3% | – | 8% |
| Gravis Marketing | June 11–13, 2018 | 469 | ± 4.5% | 43% | 49% | – | – | 8% |

### Results

Gianforte defeated Kathleen Williams on November 6, 2018.
Montana's at-large congressional district, 2018 :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Greg Gianforte (incumbent) | 256,661 | 50.88% | +0.93% |
| | Democratic | Kathleen Williams | 233,284 | 46.25% | +1.88% |
| | Libertarian | Elinor Swanson | 14,476 | 2.87% | −2.81% |
| Total votes | Total votes | Total votes | 504,421 | 100.00% | N/A |
| | Republican hold | Republican hold | Republican hold | Republican hold | Republican hold |