# 2018 United States House of Representatives election in South Dakota

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The 2018 United States House of Representatives election in South Dakota was held on November 6, to elect the U.S. representative for South Dakota's at-large congressional district. The election coincided with other statewide, legislative, and local elections.
Incumbent Republican U.S. Representative Kristi Noem did not run for a fifth term and instead ran successfully for governor of South Dakota. This was the first open seat election since 2004, and the first time a male candidate was elected since 2002. This was the last U.S. House election in South Dakota until 2024 that a Democrat appeared on the November ballot.

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

* Dusty Johnson, former chairman of the South Dakota Public Utilities Commission and former chief of staff to Governor Dennis Daugaard
* Shantel Krebs, Secretary of State of South Dakota
* Neal Tapio, state senator, businessman and former Trump campaign director for South Dakota

#### Declined

* Kristi Noem, incumbent U.S. representative (running for governor)
* Eric Terrell

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Dusty Johnson | Shantel Krebs | Neal Tapio | Undecided |
| Mason-Dixon | May 21–23, 2018 | 625 | ± 4.5% | 41% | 23% | 13% | 23% |

### Primary results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Dusty Johnson | 47,032 | 46.8 |
| | Republican | Shantel Krebs | 29,442 | 29.3 |
| | Republican | Neal Tapio | 23,980 | 24.0 |
| Total votes | Total votes | Total votes | 100,454 | 100 |

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

* Tim Bjorkman, former circuit court judge

#### Failed to file

* Chris Martian, former IT professional

#### Declined

* Shawn Bordeaux, state representative
* Troy Heinert, state senator
* Mike Huether, mayor of Sioux Falls (switched to Independent)
* Brendan Johnson, former United States Attorney for the District of South Dakota
* J.R. LaPlante, former South Dakota Secretary of Tribal Relations and State House candidate in 2016
* Stephanie Herseth Sandlin, former U.S. representative
* Billie Sutton, Minority Leader of the South Dakota Senate (running for governor)

## Libertarian nomination
### Candidates
#### Declared

* George Hendrickson, former police officer

## Independents
### Candidates
#### Declined

* Mike Huether, mayor of Sioux Falls

## General election
### Predictions

| Source | Ranking | As of |
| The Cook Political Report | Solid R | June 1, 2018 |
| The Rothenberg Political Report | Solid R | June 1, 2018 |
| Sabato's Crystal Ball | Safe R | June 6, 2018 |

### Polling

| Poll source | Date(s) administered | Sample size | Margin of error | Dusty Johnson (R) | Tim Bjorkman (D) | Other | Undecided |
| Change Research (D) | November 2–4, 2018 | 851 | – | 51% | 41% | 5% | – |
| Emerson College | November 1–4, 2018 | 514 | ± 4.5% | 54% | 38% | – | 5% |
| Mason-Dixon | October 18–22, 2018 | 500 | ± 4.5% | 54% | 31% | 3% | 12% |
| Public Opinion Strategies (R-Johnson) | August 1–3 & 5, 2018 | 400 | ± 4.9% | 54% | 33% | – | 10% |
| Public Policy Polling (D-Bjorkman) | July 19–20, 2018 | 641 | ± 3.9% | 43% | 33% | – | 14% |

### Results

South Dakota's at-large congressional district, 2018 :
| Party | Party | Candidate | Votes | % | ±% |
| | Republican | Dusty Johnson | 202,695 | 60.33% | −3.77% |
| | Democratic | Tim Bjorkman | 121,033 | 36.03% | +0.13% |
| | Independent | Ron Wieczorek | 7,323 | 2.18% | N/A |
| | Libertarian | George D. Hendrickson | 4,914 | 1.46% | N/A |
| Total votes | Total votes | Total votes | 335,965 | 100.00% | N/A |
| | Republican hold | Republican hold | Republican hold | Republican hold | Republican hold |

#### Counties that flipped from Republican to Democratic

* Corson (largest city: McLaughlin)