Tuesday's primaries in Indiana and Ohio test Donald Trump's enduring influence over the Republican Party as he seeks retribution against Indiana GOP state senators who rejected his congressional redistricting plan. Trump has endorsed challengers in seven state Senate districts, with outside groups like Turning Point USA and the Club for Growth heavily investing in these races. In Ohio, the 9th District US House primary features Derek Merrin, Josh Williams, and Madison Sheahan competing to challenge Democrat Marcy Kaptur, while Senate and governor primaries are largely settled for November. Indiana's 4th District also sees Rep. Jim Baird facing Craig Haggard. These outcomes will gauge Trump's power and the GOP's post-Trump trajectory.