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

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.

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

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

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

Democrats (and allied independents) currently hold a bare majority in the U.S. Senate, with 51 seats to Republicans’ 49. But control of the chamber is at stake in November, and the Senate race in Ohio is one of a few competitive contests that could decide control of the chamber.

Three Republican contenders are facing off today for a chance to challenge incumbent Democrat Sherrod Brown in that contest: Matt Dolan, a state legislator running with the endorsement of former Ohio Sen. Rob Portman; Frank LaRose, the current Ohio Secretary of State running on a campaign of conservatism and electability; and Bernie Moreno, a businessman with endorsements from Trump, a dozen members of Congress including Ohio Sen. J.D. Vance and the Club for Growth PAC, one of the oldest conservative PACs in the country.

Moreno, who appeared alongside Trump in several campaign events this past weekend, has gained significant ground in the polls since the former president endorsed him in mid-December. Then, he was polling at 16 percent in 538’s polling average — and now he’s hovering in the mid- to-high-20s. Democrats view Moreno as the weakest candidate for the general election and last week began airing a television ad intended to boost his standing by “attacking” his conservative record and support for Trump ahead of Tuesday's primary.

But the polls show a tied race between Dolan and Moreno, who each lead LaRose by 10 percentage points. That’s too close for polls to provide a reliable signal of who is decisively leading: Per our database of historical polls, surveys of Senate primaries miss the margin between the winner and runner-up by 6.5 points on average.

Looking ahead to the general election, the winner of today’s Republican primary matters not just in deciding who might be Ohio’s next senator, but in deciding control of the Senate come 2025. Since West Virginia Democratic Sen. Joe Manchin decided to retire, prognosticators largely expect the Republicans to pick up at least one seat this November. That means Democrats and Republicans start their fight for the majority from a 50-50 tie, and Democrats need to at least hold on to the rest of their endangered seats — and for Biden to win — to maintain control.

Ohio is a red state, but Brown has managed to run ahead of expectations in previous cycles. So has fellow endangered Democrat, Montana Sen. Jon Tester. But neither of them have run in a presidential cycle since 2012, when President Barack Obama pulled off a surprising reelection and Democrats gained two seats in the Senate. Brown will face not just the strength of his opponent in November, but the partisanship of his constituents. The Cook Political Report rates the Ohio Senate race a toss-up.

—G. Elliott Morris, 538