The 2026 United States House of Representatives election in South Dakota is scheduled to be held on November 3, 2026, to elect a member of the United States House of Representatives to represent the state of South Dakota from its . The election will coincide with other elections held on the same date. The primary elections will be held on June 2, 2026, and in races where no candidate receives at least 35% in a primary, runoff elections took place on July 28.
Incumbent Republican representative Dusty Johnson was re-elected with 72.0% of the vote in 2024.
Primary elections were held on June 2, 2026. Jackley received 79.2% of the vote against minimal opposition and Gronli ran unopposed for their respective party's nominations. Republicans have not lost a Congressional election in South Dakota since 2008.
Republican primary Candidates Nominee Marty Jackley, South Dakota Attorney General (2009–2019, 2023–present) and candidate for governor in 2018 Eliminated in primary James Bialota Jr., small business owner and real estate investor
Withdrawn Casey Crabtree, state senator from the 8th district (2020–present) and former Majority Leader of the South Dakota Senate (endorsed Jackley)
Declined Dusty Johnson, incumbent U.S. representative (ran for governor)
Endorsements
Fundraising Campaign finance reports as of May 13, 2026CandidateRaisedSpentCash on handCasey Crabtree (R)$254,650$183,634$71,016Marty Jackley (R)$1,331,302$264,431$1,066,870Source: Federal Election Commission
Polling Poll source Date(s)administered Samplesize Marginof error JamesBialota MartyJackley UndecidedMason-Dixon Polling & StrategyApril 7–11, 2026500 (RV)± 4.5%12%68%20%Emerson CollegeMarch 7–9, 2026415 (LV)± 4.8%7%51%41%
Poll source Date(s)administered Samplesize Marginof error CaseyCrabtree MartyJackley TonyVenhuizen UndecidedGuidant Polling & Strategy (R)June 17–19, 2025400 (LV)± 4.9%5%48%5%42%
Poll source Date(s)administered Samplesize Marginof error JamesBialota CaseyCrabtree MartyJackley UndecidedMason-Dixon Polling & StrategyOctober 16–20, 2025502 (RV)± 4.5%2%5%57%36%
Results
Democratic primary Candidates Nominee Nikki Gronli, former South Dakota state director for USDA Rural Development (2022–2025) and former vice chair of the South Dakota Democratic Party
Withdrawn Billy Mawhiney, nonprofit executive
Endorsements
Fundraising Campaign finance reports as of May 13, 2025CandidateRaisedSpentCash on handNikki Gronli (D)$213,223$110,642$102,581Source: Federal Election Commission
Independents Candidates Filed paperwork Jack Pittman
General election Predictions SourceRankingAs of Decision Desk HQ July 14, 2026 The Cook Political Report July 10, 2025 Inside Elections July 10, 2025 Sabato's Crystal Ball July 10, 2025
Polling Poll source Date(s)administered Samplesize Marginof error MartyJackley (R) NikkiGronli (D) UndecidedLake Research Partners (D)August 26–30, 2026 (LV)–47%43%10%
Post-primary endorsements
Fundraising Campaign finance reports as of May 13, 2026CandidateRaisedSpentCash on hand Marty Jackley (R)$1,331,302$264,431$1,066,870 Nicole Gronli (D)$213,223$110,642$102,581Source: Federal Election Commission
Notes
Partisan clients
References
External links Official campaign websites Nikki Gronli (D) Marty Jackley (R)