On Tuesday, May 5, 2026, primary elections in Ohio and Indiana determined candidates for key federal and state offices. In Ohio, former Democratic Senator Sherrod Brown challenged Ron Kincaid in the Senate primary, seeking a rematch after a narrow 2024 loss, with the seat potentially pivotal for U.S. Senate control; the 9th Congressional District saw five GOP candidates vying to unseat long-serving Democrat Marcy Kaptur in a newly redrawn Republican-leaning district. For governor, term-limited Republican Mike DeWine's successor race featured Trump-endorsed biotech billionaire Vivek Ramaswamy against "The Car Guy" Casey Putsch, with Democrat Amy Acton unopposed. In Indiana, President Trump heavily influenced state Senate primaries, endorsing challengers against seven incumbents who opposed a GOP-favored redistricting plan aimed at securing all nine congressional districts, a move that could shift control of the 25-seat chamber up for election.