Primaries to Watch Today: Races in Ohio, California, Illinois and More

Five states will hold presidential primaries on Tuesday — Arizona, Florida, Illinois, Kansas and Ohio — the largest such set of contests since Super Tuesday three weeks ago.

But with the presidential nominating contests already decisively clinched, neither of the presumptive nominees will make appearances in those states today. Instead, President Biden will travel to Nevada, a top fall battleground, visiting Reno and Las Vegas, while Dr. Jill Biden, the first lady, will campaign across New England. Former President Donald J. Trump campaigned in Ohio on Saturday.

The attention today is on a handful of down-ballot races.

Chief among them is the Republican primary for a competitive Senate seat in Ohio. Three Republicans are duking it out for the chance to run against Senator Sherrod Brown, a Democrat.

Mr. Trump stumped for his preferred candidate, Bernie Moreno, a former car dealer from Cleveland, on Saturday but mentioned him only sparingly in his caustic, freewheeling speech at a rally in Vandalia in which he said that some migrants were “not people” and that the country would face a “blood bath” if he lost in the November election. Mr. Moreno will face off against Frank LaRose, the Ohio secretary of state, and Matt Dolan, a wealthy state senator, in the primary.

In Illinois, a number of competitive House primaries could signal some of the contours of the fall election.

In the 12th Congressional District, Mike Bost, the incumbent, is facing a Republican challenger to his right in Darren Bailey, who lost the governor’s race to J.B. Pritzker by a wide margin in 2022. Mr. Bailey is an ardent pro-Trump Republican, but Mr. Bost has Mr. Trump’s endorsement.

Danny Davis, 82, is running to keep his seat in the Democratic primary for the Seventh Congressional District. He has two significant opponents: Chicago’s treasurer, Melissa Conyears-Ervin, and a youthful community organizer named Kina Collins. But the Democratic establishment in Illinois has rallied around Mr. Davis — who is a year older than Mr. Biden, making his age a sensitive issue for the primary.

In the Fourth Congressional District, Representative Jesús “Chuy” García, a progressive Democrat, will face off against Raymond Lopez, a Chicago alderman, in a Democratic primary that has centered on immigration in Chicago. Mr. García, “a proud immigrant,” was one Democrat who criticized Mr. Biden when he referred to an undocumented migrant as “an illegal” in his State of the Union speech. Mr. Lopez is more conservative on immigration.

In California, a special primary in the 20th Congressional District will be held to complete the term of former Representative Kevin McCarthy, a Republican who was ousted from his role as speaker of the House and resigned soon after. A separate primary was held on Super Tuesday for a full term in the seat starting January 2025, with two Republicans — Vince Fong and Mike Boudreaux — advancing to the general election in November.