South Dakotans on Tuesday are deciding a primary rematch that has already reshaped the summer political calendar: the state’s first-ever Republican gubernatorial runoff, a direct result of no candidate clearing the statutory 35% threshold in June’s primary.
How the runoff came to be
The June 2 vote left the Republican field split. Toby Doeden, an Aberdeen businessman, led the pack with about 31% of the vote, but did not reach the one-third mark required to clinch the nomination. Incumbent Gov. Larry Rhoden placed second with roughly 25%, and U.S. Rep. Dusty Johnson and state House Speaker Jon Hansen trailed with approximately 23% and 21%, respectively. Because no candidate hit 35%, state law triggered a runoff between the top two finishers: Doeden and Rhoden.
The outcome of this contest will determine who represents the Republican Party on the November 3 general election ballot against Democratic nominee Dan Ahlers.
What voters will decide and where the campaigns stand
Doeden’s campaign has emphasized his business background and outsider message, seeking to extend the momentum from his first-place finish in June. Rhoden, who serves as governor, has leaned on his record in office and institutional relationships within the state Republican establishment.
Political observers say the runoff gives voters a sharper choice: a businessman who outpaced several career politicians in a crowded field, and the sitting governor who survived a fractious primary that diluted support across multiple contenders.
- Threshold rule: A candidate must earn at least 35% in the primary to avoid a runoff.
- June results: Doeden ≈ 31%, Rhoden ≈ 25%, Johnson ≈ 23%, Hansen ≈ 21%.
- Next step: Winner of the runoff faces Democrat Dan Ahlers on Nov. 3.
Turnout and county dynamics
County-by-county returns in June showed a patchwork of support, with no single competitor consolidating a broad enough coalition to reach the 35% mark. The runoff compresses the field to two campaigns that will now aim to capture the supporters of eliminated candidates and increase voter turnout ahead of the general election season.
| Candidate | June primary share (approx.) |
|---|---|
| Toby Doeden | 31% |
| Larry Rhoden | 25% |
| Dusty Johnson | 23% |
| Jon Hansen | 21% |
Why this matters locally
South Dakota’s gubernatorial contest will shape state policy priorities through the next four years, affecting rural economic development, budget priorities and relations with the state Legislature. The novelty of a primary runoff also introduces new strategic calculations for both parties: compressed campaign time, intensified voter contact and efforts to win over supporters of other primary contenders.
For voters, the runoff is an opportunity to make a decisive choice after a fragmented primary season. For the campaigns, it’s a test of organizational strength — whether each can turn a plurality into a majority by expanding their footprint beyond the bases that carried them in June.
Logistics for voters
Polls are open across the state for registered Republican voters participating in the runoff. County election offices can provide local hours and any information about absentee or early voting where applicable. The winner will be certified and move on to the general election in November.
This runoff marks an unusual chapter in South Dakota politics: a legal threshold designed to ensure broad primary support produced the state’s first head-to-head GOP runoff for governor, compressing a crowded summer primary into a high-stakes, short-window choice that will reverberate into the fall campaign.
