Illinois and Ohio primaries 2024: Trump-backed Senate candidate prevails in Ohio primary

538 tracked key House and Senate races, including a California special election.

November’s presidential matchup may be set, but Democrats and Republicans still need to decide who will run in hundreds of downballot races (e.g., for Senate and House) this fall. A batch of these contests were decided on Tuesday, March 19.

Tuesday was primary day in Ohio and Illinois, and in the biggest contest of the day, Republicans chose former President Donald Trump's endorsee Bernie Moreno as their candidate in Ohio’s U.S. Senate race. It was a good night for other Trump endorsees too, as Derek Merrin prevailed in the GOP primary for Ohio's 9th Congressional District, while incumbent Mike Bost is leading his challenger in Illinois's 12th District, as of early Wednesday morning. Plus, a special election in California could have immediate implications for House Republicans’ razor-thin majority.

538 reporters and contributors broke down the election results as they came in with live updates, analysis and commentary. Read our full live blog below.


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Checking in on the Ohio state House races

I mentioned earlier that Merrin had been involved in a speaker fight in Ohio that he lost when another candidate, Stephens, won the backing of Democrats to hold a more moderate speakership. Twenty-two Republicans in the state House joined in voting for Stephens, including Stephens himself, and were dubbed the Blue 22. They were censured by the state party. Of those running again, 12 face primary challengers. By our count, 8 of the Blue 22 running for reelection are currently ahead and 4 are running behind their challengers, according to the Ohio Secretary of State. Stephens is running unopposed, but that could spell doom for his speakership.

—Monica Potts, 538


I regret to inform you that the Amish did not overwhelmingly choose Haley

The earlier result I mentioned that appeared to show Nikki Haley had won heavily Amish Holmes County, Ohio, looks to have been a reporting error. The error has been corrected, and updated results from the Associated Press show Trump leading the county 82-11 percent with over 95 percent of the vote reporting.

—Mary Radcliffe, 538


Merrin projected to win in Ohio's 9th

Merrin, the last-minute addition to the race, is projected to win the primary in Ohio's 9th District, according to ABC News. He will face incumbent Kaptor. Despite her incumbency, the seat could be tough for the long-serving Democrat to hold onto. As Nathaniel wrote earlier, Republicans in the state redrew the district to make it more Republican. But finding the right candidate has been tough for them: They'll be holding out hope that Merrin, who's been involved in his own intraparty battles in the state, will win this November.

—Monica Potts, 538


Former deputy Democratic leader ousted in the Illinois state House

In Illinois’s 31st state House District, a battle has been brewing between longtime state representative Mary Flowers and state House Speaker Chris Welch. Flowers was the deputy Democratic leader of the chamber from 2020-2023, but was stripped of her leadership position in May 2023 after allegations of abusive conduct toward other members and staff. This year, Speaker Welch led an effort to oust her from the chamber, directing hundreds of thousands of dollars toward her challenger, Michael Crawford, and encouraging outside groups, particularly unions, to support Crawford.

The effort appears to have paid off: Crawford, an educator and political newcomer, is projected to win, according to the Associated Press. He leads the 19-term congresswoman 70-30 with 64 percent of the vote reporting.

—Mary Radcliffe, 538


And the winners are ...

It’s midnight Eastern, and all but one of our key races have been projected in Ohio and Illinois. Here’s a recap of where things stand in those races:

- Former President Donald Trump once again flexed his muscles in the Ohio Senate race, elevating former car salesman Bernie Moreno from a 2022 also-ran to the GOP nominee in one of the two top Senate races on the map, beating an uber-rich state senator and a two-time statewide officeholder in the process. But Moreno’s toughest path lies ahead, against well-funded incumbent Democratic Sen. Sherrod Brown. With 96 percent of the expected vote reporting, Moreno leads with 51 percent of the vote over state Sen. Matt Dolan’s 33 percent and Ohio Secretary of State Frank LaRose’s 17 percent.

- In Ohio's 9th District, the conservative backed by Trump and House Speaker Mike Johnson, state Rep. Derek Merrin, is projected to win, and ready to take on Democratic Rep. Marcy Kaptur in what could be a tough general election race. With 80 percent of the expected vote reporting, Merrin has won 52 percent of the vote, 18 percentage points ahead of his nearest competition.

- In Ohio’s 13th District, another potentially competitive Democratic-held seat, former state Sen. Kevin Coughlin advanced out of the GOP primary rather easily and will take on Democratic Rep. Emilia Sykes in November. With 80 percent of the expected vote in, Coughlin leads with 65 percent of the vote so far over businessman Chris Banweg’s 28 percent and Richard Morckel’s 7 percent.

- The Republican Main Street Partnership notched a win against its rivals in the House Freedom Caucus in Ohio’s 6th District, where state Sen. Michael Rulli is projected to beat state Rep. Reggie Stoltzfus. Rulli currently leads by 9 points with 83 percent of the expected vote reporting in the regular primary, and by 8 points with 82 percent of the expected vote in the special election. Rulli will face a nominal challenge from Democrat Michael Kripchak on June 11 in the special election to replace Rep. Bill Johnson.

- In another safe GOP seat, Ohio’s 2nd District Republican primary went for business owner David Taylor, who won a crowded race that was tantamount to election in November. With 95 percent of the expected vote reporting, Taylor leads with 25 percent of the expected vote over 10 other challengers.

- Despite several challengers lining up to replace Democratic Rep. Danny Davis, the long-time incumbent is likely to hold onto his seat in Illinois’s 7th District. With 76 percent of the expected vote in, Davis leads with 53 percent of the vote so far. In second is Chicago City Treasurer Melissa Conyears-Ervin with 22 percent, followed by community organizer Kina Collins with 18 percent. Collins was seen as Davis’s primary competition tonight, and her underwhelming performance was part of a tough night for progressives in Chicago.

—Jacob Rubashkin, Inside Elections; Geoffrey Skelley and Monica Potts, 538