House battle sharpens as Republicans pick challengers in Ohio, Indiana

Republicans in Ohio and Indiana chose nominees Tuesday in contests that reached far beyond state politics, setting up the first real test of the House majority fight. With all 435 seats on the ballot Nov. 3 and 218 needed for control, the primaries opened a seven-week stretch in which half of the states will vote, giving party strategists an early read on where the 2026 map may actually break.

In Ohio, the clearest stakes sat in two Democratic-held districts Republicans are trying to flip after last year’s redistricting. One is Rep. Marcy Kaptur’s Toledo-based 9th District, where former state Rep. Derek Merrin will get a rematch after narrowly losing to Kaptur in 2024. Kaptur, the longest-serving woman in congressional history, remains one of the GOP’s biggest targets in a seat that has been redrawn only slightly from earlier versions, after prior maps were struck down by courts or lacked bipartisan support since 2021. The other target is Rep. Greg Landsman’s Cincinnati-based 1st District, where Republicans are trying to determine whether they can nominate candidates with enough local appeal to make the race competitive.

Ohio matters because the map still demands more than partisan energy. Republicans need nominees who can survive in districts shaped by courts, redistricting fights and changing suburban voting patterns, not just line up with the national mood. If they cannot produce credible challengers in Toledo and Cincinnati, their path to a House majority narrows before the general election even begins.

Indiana exposed a different kind of intraparty battle. President Donald Trump and his political operation turned their attention to Republican state senators who blocked a Trump-backed proposal to redraw the state’s congressional map into a 9-0 Republican lineup. Indiana Republicans have already spent more than $12 million on advertising in the primaries, and Trump endorsed challengers in seven state Senate races tied to the redistricting fight after Senate Republicans rejected the plan last December. The clash has split GOP allies between those who cast the effort as accountability and those who see it as a threat to state autonomy and the Constitution, including state Sen. Spencer Deery.

The House implications are clearest in Indiana’s 1st Congressional District, where Republicans are again targeting Democratic Rep. Frank Mrvan. That race will test whether the party can nominate someone who can connect with the district’s diverse, working-class voters, rather than simply benefit from the redistricting fight around it. For both parties, Ohio and Indiana are now more than local contests. They are early evidence of whether the 2026 House map will be decided by strong candidates in swing districts or by wasted opportunities in the states most eager to reshape it.