Why It Matters
South Dakota’s gubernatorial race illustrates how campaign spending, media polling, and policy decisions can reshape political outcomes in unexpected ways. The state’s top-two runoff system, dormant for four decades, resurfaced this cycle and produced a result that defied conventional expectations about candidate resources and name recognition.
What Happened
Larry Rhoden, South Dakota’s acting governor since Kristi Noem resigned approximately 18 months ago to join President Donald Trump’s administration, secured the Republican Party’s nomination after winning a runoff election with 71 percent of the vote. The victory came after a four-way primary on June 2 in which Rhoden finished second to first-time candidate Toby Doeden of Aberdeen.
U.S. Representative Dusty Johnson, who had served four consecutive terms in Congress and previously spent two terms on the state Public Utilities Commission, finished third in the primary despite maintaining a substantial campaign treasury. Johnson’s unexpected elimination shocked political observers who expected his incumbency and established donor network to carry him through to the general election.
The primary results triggered South Dakota’s top-two runoff provision, a rule approved by lawmakers in 1985 that mandates a head-to-head contest when no candidate reaches 35 percent of the primary vote. The runoff mechanism had remained unused for 41 years before this cycle. Rhoden defeated Doeden decisively in the July matchup, winning by 42 percentage points and securing his path to the November 3 general election.
By the Numbers
71% — Rhoden’s share of the runoff vote
$6 million — Johnson’s accumulated campaign funds entering the primary
$4 million — Doeden’s personal spending ahead of the June 2 primary
42 percentage points — margin of Rhoden’s runoff victory over Doeden
35% — vote threshold that triggers the runoff requirement under state law
41 years — duration the runoff mechanism went unused before the 2026 cycle
52 years — time elapsed since South Dakota last elected a Democratic governor
Zoom Out
South Dakota’s Republican primary unfolded amid national trends favoring policy-focused candidates over those banking on organizational resources alone. Campaign finance advantages have traditionally correlated with primary success, yet Doeden’s personal investment and Rhoden’s governing record proved more decisive than Johnson’s cash reserves in the initial round.
The state’s runoff system represents one of the few mechanisms nationwide that prevents plurality wins in high-stakes races. While top-two primary formats exist in California, Washington, and a handful of other states, South Dakota’s approach requires a majority in a separate general runoff, creating a distinct dynamic. The 41-year gap between the law’s enactment and its first application underscores how uncommon such scenarios remain in practice.
Rhoden will face Democrat Dan Ahlers, a former state legislator from Dell Rapids, in the general election. Democrats have not won South Dakota’s governorship in over five decades, making the November matchup heavily favor the Republican nominee regardless of primary outcome.
Policy as Political Advantage
Rhoden’s primary and runoff success coincided with his signing of legislation that appealed to distinct constituencies within the Republican electorate. He signed a bill prohibiting the use of eminent domain for carbon capture pipeline projects, addressing rural landowner concerns. He also authorized $650 million in spending for men’s prison construction and signed measures using sales tax mechanisms to reduce property tax burdens on homeowners.
Rhoden characterized his approach bluntly: “good policy makes good politics.” His legislative record provided a tangible contrast to Johnson’s congressional tenure and Doeden’s newcomer status, allowing him to consolidate support after finishing second in the primary field.
What’s Next
Rhoden advances to the November 3 general election as the Republican nominee with substantial momentum. Ahlers will mount a Democratic challenge in a state where the party has not captured the governor’s office since 1974. The general election will test whether Rhoden’s primary coalition—strengthened by policy accomplishments and demonstrated governing authority—can sustain itself through the fall campaign.