Trump Shows Republican Grip in Indiana Primaries, Democrats Gain Momentum

Indiana delivered the clearest proof that Donald Trump still commands Republican voters, but it also showed the limits of his power. Five Trump-backed challengers defeated incumbent GOP state senators in primaries after those lawmakers had resisted a mid-decade redistricting push, one incumbent survived, and one race was still too close to call in the initial count.

The fight began when the Indiana Senate rejected the redistricting plan on Dec. 11, 2025, by a 31-19 vote. That decision preserved the state’s two Democratic-held U.S. House seats and set off a bitter intraparty clash that made normally quiet legislative races a test of loyalty to Trump. The president and his allies pressed for revenge, and the money followed. One estimate put advertising spending at about $12 million across the seven contested races, while another said pro-redistricting groups alone spent about $6 million on ads, alongside direct mail and pre-primary events.

The results sent a warning to Republicans who defied Trump, but they did not amount to a total purge. Greg Walker, one of the defeated senators, said after losing that he stood by his vote against redistricting. His loss, and the survival of one incumbent, underscored both Trump’s reach and the fact that even in a heavily Republican state, his line did not sweep every target off the board.

Michigan offered Democrats a different kind of signal. Chedrick Greene, a Saginaw fire captain and former U.S. Marine, won the state Senate District 35 special election on May 5, defeating Republican Jason Tunney and keeping the chamber in Democratic hands. Before the race, Democrats held a 19-18 majority. After Greene’s victory, they expanded that edge to 20-18, locking in control of the Michigan Senate through the end of 2026.

Ohio added another piece to the picture. Sherrod Brown won the Democratic primary and will face Republican Jon Husted, who was appointed in 2025 to fill JD Vance’s vacant Senate seat, in November. The race is already expected to be one of the most expensive and consequential of the 2026 cycle.

Taken together, the three states separated signal from noise. Indiana showed Trump can still discipline Republicans in low-profile state races. Michigan and Ohio showed Democrats are not waiting for a general-election reset to find momentum, and that turnout, money and local backlash could still shape the fall.