CUYAHOGA FALLS, OH - MAY 1: (L-R) Conservative activist Charlie Kirk, J.D. Vance, a Republican candidate for U.S. Senate in Ohio, and Sen. Josh Hawley (R-MO) speak with reporters at a campaign rally on May 1, 2022 in Cuyahoga Falls, Ohio. Former President Donald Trump recently endorsed J.D. Vance in the Ohio Republican Senate primary, bolstering his profile heading into the May 3 primary election. Other candidates in the Republican Senate primary field include Josh Mandel, Mike Gibbons, Jane Timken, Matt Dolan and Mark Pukita. (Photo by Drew Angerer/Getty Images)

COLUMBUS, Ohio (AP) — Ohio Republicans will vote Tuesday in one of the most contentious and closely watched Senate primaries in the nation. Author and venture capitalist JD Vance is seen as the GOP front-runner in the race to replace retiring Sen. Rob Portman after receiving former President Donald Trump’s endorsement. The winner is likely to face 10-term Democratic congressman Tim Ryan in what is expected to be a brutal November for Democrats. Incumbent Republican Gov. Mike DeWine appears well positioned to secure his party’s nomination for another term. In Indiana, more than a dozen state House members are trying to fend off Republican challenges from the right.