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

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

Last Updated: March 19, 2024, 5:29 PM EDT

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.

Latest headlines:

Here's how the news is developing.
Monica Potts Image
Mar 19, 2024, 6:01 PM EDT

Tracking how Democratic women do tonight

In the past three elections women have set records for representation in Congress, and when the 118th Congress was sworn in last January they held 28 percent of seats, the highest percentage ever. Of course, Vice President Kamala Harris holds the highest federal office a woman has ever held, and former U.N. Ambassador Nikki Haley became the first Republican woman to win a GOP nominating contest this year when she won the races in Washington, D.C., and Vermont. Whether and how women continue to make progress in this election cycle is still being decided this primary season.

Across the primaries in Illinois and Ohio, 17 Democratic women are running for seats in Congress, including nine incumbents.

That list includes some big races. Among them is the race for Illinois’s 7th Congressional District, which includes parts of Chicago, where 28-year incumbent Democratic Rep. Danny Davis’s two biggest challengers are women. As Kaleigh mentioned earlier, his biggest threat is Kina Collins, a progressive activist who challenged Davis in 2020 and 2022, running to his left on issues like gun violence prevention and health care reform. She came within 7 percentage points of Davis in 2022, earning 46 percent of the vote to his 52, and has a higher profile this year and more funding from national groups. Another major candidate is Melissa Conyears-Ervin, who’s now serving as Chicago’s treasurer and has been endorsed by the Chicago teacher’s union. Conyears-Evans also faces an ethics probe after firing whistleblowers who accused her of ethics violations and misuse of public resources. Both women are attacking Davis’s age — he is 82 — while Davis says his constituents benefit from his seniority.

—Monica Potts, 538

Kaleigh Rogers Image
Mar 19, 2024, 5:56 PM EDT

Two endangered incumbents in Illinois

Two members of Congress, a Democrat from a deep blue seat and a Republican from a deep red one, are facing challenges in their primary races tonight. Both are leading in the polls for their respective races, but not enough to deem these elections all sewn up. You can read more about these races and others worth watching tonight in Ohio and California in our preview from yesterday, but here are the deets on the two potential dethronings in the Land of Lincoln.

When 82-year-old Democratic Rep. Danny Davis was first elected in the 7th District around Chicago, Kina Collins — the progressive challenger giving Davis a run for his seat tonight — wasn’t even old enough to vote. There are three other candidates in the race too — one, Chicago City Treasurer Melissa Conyears-Ervin, has outraised both Collins and Davis — but Collins, a community organizer and gun-control advocate, is probably the incumbent’s steepest competition. She came within 7 points of ousting Davis in 2022. However, Davis has the backing of Illinois’s Democratic elite, including Gov. J.B. Pritzker, Chicago Mayor Brandon Johnson and Cook County Board President Toni Preckwinkle, and was leading in a poll from December, so it may not be curtains for the congressman just yet.

Rep. Danny Davis participates in the House Ways and Means Committee "Hearing with the IRS Whistleblowers: Hunter Biden Investigation Obstruction in Their Own Words" Dec. 5, 2023.
Bill Clark/CQ-Roll Call via Getty Images

Meanwhile, southern Illinois’s 12th District also has an exciting race as Republican Rep. Mike Bost faces off against former state Sen. Darren Bailey, the Republican nominee for governor in 2022. In this district, the reddest in the state, Bailey and Bost have been flaunting their conservative bona fides in an attempt to out-MAGA one another and prove who is further right. Both candidates were endorsed by Trump in 2022, and both have deeply conservative views on issues like abortion, immigration and guns. In this race, Trump has endorsed Bost. Still, the two are polling closely, and whoever wins this primary will be all but guaranteed a seat in Congress, so it’s definitely one to keep an eye on.

Kaleigh Rogers, 538

Nathaniel Rakich Image
Mar 19, 2024, 5:52 PM EDT

We’re tracking anti-abortion Republican candidates

Since the 2022 Supreme Court decision overturning Roe v. Wade, abortion has been a major issue in U.S. politics — usually to Democrats’ benefit. Many Republicans have taken anti-abortion stances that are unpopular with the general public (though perhaps not with a GOP primary electorate).

In order to track how those candidates fare this year, we at 538 are keeping a list of every Senate, House and gubernatorial candidate this year who presents themself as an opponent of abortion. There’s no perfect way to measure this, but we’re doing so by searching campaign websites for the phrases “pro-life,” “sanctity of life,” “right to life,” “no abortion,” “against abortion” and “unborn” (excluding candidates who say these things but also say that abortion policy should be left to the states). Throughout the year, we’ll be tracking how these candidates fare in both primaries and the general election. Here’s a list of those who are on the ballot today.

—Nathaniel Rakich, 538

Mar 19, 2024, 5:47 PM EDT

Moreno viewed more favorably by strong Republicans in Ohio

Among registered Ohio voters who identify as Republicans, Moreno’s image is a bit more favorable than the other candidates among voters that identify as “strong Republicans,” but weaker among “not very strong Republicans.” In a SurveyUSA/Ohio Northern University poll published last week, voters were asked if they had a favorable or unfavorable opinion of various politicians. Among strong Republicans, Moreno had net +26 favorability, while LaRose and Dolan were each at net +20 percent favorability. Among not very strong Republicans, Dolan was in the lead with net +12 favorability, compared to LaRose at +9 and Moreno at +5.

—Mary Radcliffe, 538

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