South Dakota AG Marty Jackley Leads GOP House Primary Poll With High Undecided Voters

Attorney General Marty Jackley is the clear frontrunner in the 2026 Republican primary for South Dakota's open U.S. House seat, leading with 57% support among GOP voters according to multiple statewide polls conducted by Mason-Dixon Polling and co-sponsored by South Dakota News Watch and the Chiesman Center for Democracy. His main challengers, State Senator Casey Crabtree and businessman James Bialota, trail significantly with 5% and 2% respectively, while 36% of voters remain undecided. Jackley's strong name recognition stems from his extensive public service, including multiple terms as South Dakota's attorney general and a previous gubernatorial run, as well as robust fundraising and political backing. Crabtree, who lost his majority leader position after sponsoring controversial legislation, emphasizes conservative policies aligned with Trump's "America First" agenda but has less statewide recognition and funding. Bialota, a disabled Air Force veteran and small-business owner, faces challenges with name recognition and legal issues. The primary election is scheduled for June 2, 2026, with a potential runoff set for July 28 if needed.