Matt Dolan, Ohio Senate Republican from the 24th District, listens to colleagues speak at the Ohio State House Senate Chambers in Columbus, Ohio, Wednesday, Feb. 28, 2024. (AP Photo/Joe Maiorana)
FILE - Sen. Rob Portman, R-Ohio, listens during a news conference about the border, Wednesday, Dec. 21, 2022, on Capitol Hill in Washington. Republican Matt Dolan has landed the endorsement of Portman, Friday, March 8, 2024, in the fractious three-way primary to take on Democratic U.S. Sen. Sherrod Brown this fall, a potentially important boost in the final run-up to the contest. (AP Photo/Mariam Zuhaib, File)