Indiana and Ohio Voters Decide Trump's Biggest Primary Test of 2026 as Redistricting Revolt Reaches the Ballot

Voters across Indiana and Ohio cast ballots Tuesday in the first significant primary contests of the 2026 cycle, transforming both states into stress tests for President Donald Trump's grip on the Republican Party and for his still-controversial drive to redraw congressional maps before the November midterms.

In Indiana, Trump has personally intervened in seven ordinarily quiet state Senate primaries, endorsing challengers to a slate of Republican incumbents who blocked his demand that the legislature redraw the state's U.S. House map to add another GOP-leaning district. Allies of the president, including a super PAC backed by Elon Musk and Indiana Attorney General Todd Rokita, have poured millions of dollars into the obscure down-ballot races to oust the senators Trump has labeled "RINOs." A separate, higher-profile contest pits four-term Rep. Jim Baird, who carries a Trump endorsement issued in January, against state Rep. Craig Haggard, a Rokita-backed challenger arguing that Baird has not been combative enough on Capitol Hill.

The retribution campaign carries unusual stakes because Indiana is one of several Republican-controlled states being pressured to redistrict midcycle following the Supreme Court's April 29 ruling in Louisiana v. Callais, which weakened Section 2 of the Voting Rights Act. Trump has publicly demanded new GOP-friendly maps in Texas, Missouri, North Carolina, and Indiana, but the Indiana state Senate refused, leaving the president searching for a way to break the deadlock at the ballot box. "If a Republican won't vote for the map, they're not really a Republican," Trump wrote on Truth Social last week. Hoosier Republicans who voted against the map have warned that the special-session map being floated would dilute existing GOP-held districts and could backfire in a wave year.

Across the border in Ohio, the marquee race is the Republican gubernatorial primary, where biotech entrepreneur and former presidential candidate Vivek Ramaswamy is expected to capture the GOP nomination to replace term-limited Gov. Mike DeWine. Ramaswamy, who carries Trump's endorsement, will face former Ohio Department of Health director Dr. Amy Acton, the consensus Democratic pick and a fixture of the state's COVID-era response. Polling has tightened as Trump's national approval rating has slipped — a Pew Research Center survey released last week showed the president losing ground on personal traits including honesty and competence — and Acton's campaign has openly framed November as a referendum on the administration's handling of inflation, the Strait of Hormuz crisis, and gas prices that have hit $4.46 per gallon.

Ohio's congressional primaries are also being closely watched after the Supreme Court's redistricting decision opened the door to renewed map fights. The 13th Congressional District — a Democratic-leaning seat in the Akron area — is one of several that Republicans believe could be redrawn before November if courts allow midcycle changes. Ohio Republican Party Chair Alex Triantafilou told reporters Monday that the state would "watch what happens in Louisiana very, very carefully" before considering any new map of its own.

Polls in Indiana close at 6 p.m. local time and in Ohio at 7:30 p.m. eastern time. National Republican strategists privately concede that strong showings by Trump-endorsed challengers would embolden the White House to expand the redistricting push into Missouri and North Carolina, while underperformance — particularly losses by his Indiana state Senate picks — would mark the first significant crack in his post-2024 hold on the party. Either outcome will set the tone for a dozen more states holding primaries through May, including Nebraska and West Virginia next Tuesday.