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, 10:49 PM EDT

Checking in on anti-abortion Republican candidates

Of the 29 anti-abortion Republican candidates we're tracking, 15 have been projected to win per ABC News, including 6 incumbents. Twelve challengers are projected to lose their races (though, of course, many were running in the same contests, like the crowded Ohio 2nd District race). In the only race on this list that's not yet projected, Illinois's 12th District, incumbent Mike Bost is leading Darren Bailey — both are on the list. With abortion shaping up to be an important issue in the fall, these candidates have all made pro-life statements without saying abortion should be left to the states. That could signal their willingness to support a national abortion ban, as some Republican and national anti-abortion groups are advocating for.

—Monica Potts, 538

Jacob Rubashkin Image
Mar 19, 2024, 10:43 PM EDT

Rulli projected to win

In Ohio’s 6th District, Michael Rulli is projected to defeat Reggie Stoltzfus in the Republican primary, according to ABC News. Rulli currently leads by about 9 percentage points in the regularly scheduled primary and 8 points in the special election primary to succeed Rep. Bill Johnson, with over 80 percent of the expected vote reporting in each. Because the district is solidly Republican, Rulli will likely be the next member of Congress. A special election in a few months will send him to D.C., where he’ll fill out the remainder of Johnson’s term.

—Jacob Rubashkin, Inside Elections

Jacob Rubashkin Image
Mar 19, 2024, 10:41 PM EDT

How much is a House seat worth?

And Geoff, it only cost Taylor $1.7 million. Not a bad deal given how much some other self-funders have spent just to come up short. (David Trone dropping $13 million to lose my home district, MD-08, in 2016 comes to mind.)

—Jacob Rubashkin, Inside Elections

G. Elliott Morris Image
Mar 19, 2024, 10:39 PM EDT

Senate primary polls usually misfire, but not by this much

As I noted in the opener for our live blog today, the polls in Ohio's Senate race showed a "close race" between Moreno and Dolan, with LaRose in a somewhat distant third. The result, however, is anything but close. With 85 percent of the expected vote reporting, Moreno currently has a lead of 17 points, making for an 18-point miss in our polling average (after you account for some rounding). This is not the largest miss in Senate primary polling history — that honor belongs to surveys of the 2018 Republican primary for a special Senate election in Mississippi — but it is nevertheless very large. An 18-point miss is about 2 times the size of the expected miss of primary polls in historical Senate races (8.2 points).

This miss is notable because it's actually larger than historical expectations. That's the opposite of what we've been seeing with presidential primary polls — which, while they have systematically overestimated support for Trump this cycle, have at least been more accurate than the historical average presidential primary survey. Pollsters will need to do some work to figure out what went wrong.

—G. Elliott Morris, 538

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