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.


Republicans have their candidate in Ohio's competitive 13th District

In Ohio's 13th District, former state Sen. Kevin Coughlin is projected to win, according to ABC News. With 27 percent of the expected vote reporting, Coughlin is way out ahead with 67 percent of the vote, putting him well ahead of Hudson City Councilor Chris Banweg, who has 26 percent. Coughlin had a slight fundraising edge over Banweg, but it wasn't evident coming into the election if one candidate had a clear upper hand. Turns out, Coughlin did. Now he'll face Democratic Rep. Emilia Sykes in the purple seat that sits around Akron, south of Cleveland, one that Biden would have only carried by 3 percentage points in 2020.

—Geoffrey Skelley, 538


Tough night for Chicago progressives

As Cooper mentioned earlier, the Chicago tax reform measure supported by Mayor Johnson is currently behind: With 66 percent of the expected vote in, "no" leads 54 to 46 percent, according to the Associated Press. In another blow to Chicago-area progressives, their preferred candidate is also behind in the Cook County State's Attorney election. According to the Associated Press, progressive Clayton Harris III is losing 52 to 48 percent to moderate retired Judge Eileen O'Neill Burke, with 73 percent of the expected vote counted.

—Mary Radcliffe, 538


Checking in on Democratic women

In Illinois's 6th District, ABC News reports that Manoor Ahmad is projected to lose against incumbent Sean Casten. With a little more than half of the expected vote in, she's gotten about 15 percent of the vote. Ahmad, who was born in Pakistan, had advocated for a permanent cease-fire in the Israel-Hamas War. She'd also endorsed Rep. Ro Khanna's "Poltiical Reform Resolution" and increased federal spending on immigration lawyers and judges as immigration reform. Meanwhile, Casten joined a resolution condeming the Oct. 7 attacks and declaring support for Israel at the beginning of the conflict, but has also called for humanitarian pauses and outlined the accountability he feels is necessary for a cease-fire.

Progressive activist Kina Collins and Chicago City Treasurer Melissa Conyears-Ervin are also projected to lose their bids challenging incumbent Danny Davis in Illinois's 7th District. With over 60 percent of the expected vote reporting, Davis has 52 percent of the vote to Conyears-Ervin's 21 percent and Collins's 19 percent. Davis is almost certain to hold his seat this fall in the safe blue district.

—Monica Potts, 538



Merrin starting to pull away in Ohio's 9th

With 39 percent of the expected vote in, Merrin is slightly ahead in the 9th District with 45 percent of the vote so far, and Riedel is at 42 percent. As my colleagues chatted about earlier, the 9th may be one of the tests of Trump's strength when it comes to swaying voters in the primaries, at least. While his endorsement of Merrin came late in the game, part of the reason Merrin was recruited was because Riedel, the party's previous pick, had been caught being slightly critical of Trump. It's not just a question of whether Trump has remade the party in his image: It's also about whether it tolerates dissent.

—Monica Potts, 538


The intraparty battles shaping Ohio state House races

In the Ohio House of Representatives, a speaker battle from last year is playing out in the GOP state legislative primaries tonight.

Republicans have veto-proof majorities in both chambers. But when it came time to elect a speaker at the start of the term last year, a moderate Republican, state Rep. Jason Stephens, beat a far-right candidate, Derek Merrin, in a surprising upset thanks to backing from the chamber’s Democrats and 22 Republicans (including Stephens himself). As speaker, Stephens has control over which bills make it to the floor, and Democrats backed him in exchange for support on some of their policy priorities. Meanwhile, the conservative wing of the party censured those 22 members, dubbing them the “Blue 22.”

This year, Merrin himself is term-limited and running in the 9th Congressional District , while the conservatives who backed him for speaker are now backing challengers against half of the pro-Stephens Republicans. National groups have also stepped in to back these challengers, telling the Statehouse News Bureau that they don't want to just elect Republicans; they also want to support a "bold conservative policy agenda." Adding yet another dynamic to the conflict, the current state Senate President Matt Huffman, a conservative who is also term-limited in the Senate, has jumped into the fray and is running unopposed for a state House seat. He has signaled that he wants to be speaker, and donated to the incumbents who backed Merrin in the speaker fight.

The tug-of-war between the far-right and more moderate members of the Republican Party is playing out in states around the country, and, in some cases, among far-right members themselves. Some of the infighting is centered over what happened in 2020 and the false claim that Trump actually won, and could seriously weaken the state parties heading into competitive general election contests in states like Michigan, Arizona and Georgia. In safe-red Ohio, the consequences could be more localized, but the speaker race, for example, will have a major impact on the kinds of bills the state legislature tries to pass next year around divisive issues like abortion or redistricting.

—Monica Potts, 538