Democrat Catelin Drey won Tuesday’s special election in Iowa’s Senate District 1, collecting about 55% of the vote to Republican Christopher Prosch’s 44%, according to unofficial results from the Woodbury County auditor’s office. The outcome flips a district Donald Trump carried by 11 points in 2024 and dissolves the Republican two-thirds supermajority in the 50-member Iowa Senate. Republicans now hold 33 seats to Democrats’ 17, meaning the GOP will need at least one Democratic vote to confirm Governor Kim Reynolds’s appointments and approve other measures that require a supermajority. The western Iowa seat, centered on Sioux City, became vacant after Republican Senator Rocky De Witt died of pancreatic cancer in June. Drey, a 37-year-old marketing account executive, will serve the remainder of the term through January 2027. Both national and state party committees poured funds and ground support into the contest, which marks the latest in a series of special-election over-performances for Democrats ahead of the 2026 midterms.