South Dakota’s at-large House seat features Republican nominee Marty Jackley, the state attorney general with strong primary support and substantial fundraising, against Democrat Nikki Gronli in a state where Republicans have held the seat continuously since 2008. All major forecasters rate the race Solid or Safe Republican, consistent with the state’s partisan composition and recent voting trends in presidential and congressional contests. Jackley’s experience in statewide office and alignment with core voter priorities on spending and agriculture reinforce his position ahead of the November 3 general election. The wide gap in implied probability leaves limited room for shifts, though late developments such as an unforeseen scandal, health event, or sharp national swing could still alter the outcome before ballots are cast.