South Dakota voters headed to the polls Tuesday to fill the state's only U.S. House seat, a contest that opened after incumbent Rep. Dusty Johnson (R) gave up the seat for an unsuccessful gubernatorial bid. The race pits Republican state Attorney General Marty Jackley against Democrat Nikki Gronli, with Jackley widely seen as the front-runner in the heavily Republican state.
Polls closed at 8 p.m. EST, and results are flowing in from counties across the state. Decision Desk HQ is tracking the returns in real time, providing a county-by-county breakdown as the night unfolds.
Jackley's established profile
Jackley, who has served as South Dakota's attorney general since 2019, brings decades of legal and political experience to the race. He previously held the same office from 2009 to 2015 and has been a prominent figure in state Republican politics. His campaign emphasized conservative principles, including border security, energy independence, and support for agricultural communities.
His opponent, Nikki Gronli, is a Democrat who has focused her campaign on healthcare access, rural economic development, and education funding. Despite the state's Republican lean, Gronli has sought to appeal to independents and moderate voters by highlighting her business background and commitment to bipartisan problem-solving.
National implications
The race is one of several special elections and open-seat contests drawing national attention this cycle. While South Dakota's at-large seat is not considered competitive in the general election, the outcome will be closely watched as a bellwether for Republican enthusiasm heading into the midterms. Similar dynamics are playing out in other states, such as South Carolina's Senate race, where incumbent Lindsey Graham faces a challenge, and in Texas, where a dozen open House seats are on the ballot.
The open seat in South Dakota also comes amid a broader reshuffling of the state's political leadership. Gov. Kristi Noem's departure to the Trump administration created a vacancy that Lt. Gov. Larry Rhoden filled, and Rhoden is now seeking a full term, as detailed in coverage of the governor's race. Meanwhile, Sen. Mike Rounds is running for a sixth term, facing an independent challenger, as reported in South Dakota's Senate contest.
What to watch
As returns come in, key indicators will include turnout in Minnehaha and Pennington counties, the state's most populous areas. Jackley is expected to perform strongly in rural counties, while Gronli may find support in college towns and urban centers. The margin of victory could signal the strength of the Republican brand in a state that has not elected a Democrat to the House since 2010.
With control of the House narrowly divided, every seat matters, but this one is likely to remain in GOP hands. Still, the final tally will be analyzed for clues about voter sentiment ahead of the 2026 midterm elections. Follow the live results below for the latest updates.
