Indiana Republican primary voters will decide tomorrow whether to heed President Donald Trump's call for retribution against state senators who blocked his effort to redraw the state's congressional maps.

Seven GOP state senators voted against the mid-decade redistricting plan late last year, defying Trump's demands to create more Republican-friendly House districts ahead of the 2026 midterms. Trump responded on Truth Social, declaring the Republicans "should be ashamed of themselves" and that "every one of these people should be primaried." He has since endorsed challengers in nearly all of those races, turning the May 5 primaries into a test of his influence within the party.

The targeted incumbents include Sens. Spencer Deery of District 23, Jim Buck, Linda Rogers, Dan Dernulc, Travis Holdman, Greg Goode, and Greg Walker. Trump's picks are Paula Copenhaver against Deery, Tracey Powell against Buck, Dr. Brian Schmutzler against Rogers, Trevor DeVries against Dernulc, Blake Fiechter against Holdman, Brenda Wilson against Goode, and state Rep. Michelle Davis against Walker. Sen. Eric Bassler, another opponent, opted not to seek reelection, prompting Trump to back Jeff Ellington.

Nearly $7 million has poured into TV ads for these state Senate races, with Trump-aligned dark money groups contributing $1.5 million and the Club for Growth adding about $2 million in mailers and support for the challengers. The Senate Republican campaign arm has countered with $1.8 million to defend incumbents, who have outraised their opponents overall.

Challenger Paula Copenhaver praised Trump's endorsement as humbling and criticized the senators for missing a chance to strengthen Indiana Republicans federally. Deery dismissed the race's focus on ads, saying it boils down to voter belief in them. Buck, facing over $1 million in opposition spending, lamented Washington's meddling despite his past support for Trump.

Lt. Gov. Micah Beckwith, a Trump ally, framed the contests as a battle between establishment Republicans and the America First agenda, predicting three wins would send a message, and five would reclaim Senate control. Club for Growth President David McIntosh called it an all-in effort to elect new senators.

The push stems from Trump's broader strategy to protect the GOP's narrow House majority amid legal and political hurdles to redistricting nationwide. Success in Indiana could bolster his leverage over other state legislatures, while defeats might signal limits to his retribution campaign as voters prioritize local issues like property taxes over the year-old redistricting fight.