Nikki Gronli, a former South Dakota state director for USDA Rural Development, is the Democratic nominee for South Dakota's open at-large U.S. House seat in 2026 against Republican Marty Jackley.
2026 Races & Market Forecast
Live TruthIndex™ and prediction market consensus for races contested by Nikki Gronli.
Biography & Campaign Analysis
2026 race
Nikki Gronli, who served as South Dakota state director for USDA Rural Development from 2022 to 2025 and was formerly vice chair of the South Dakota Democratic Party, is the Democratic nominee for the state's at-large seat in the U.S. House.
The seat is open in 2026; its incumbent, Republican Dusty Johnson, was re-elected with 72.0% of the vote in 2024. Gronli ran unopposed in the June 2, 2026, Democratic primary, from which nonprofit executive Billy Mawhiney withdrew.
In the general election on November 3, 2026, Gronli faces Republican Marty Jackley, the attorney general of South Dakota, who won the Republican primary with 79.2% of the vote.