Mike Gibbons and Josh Mandel lead the Ohio GOP Senate primary field as Republicans battle for the chance to run for the seat being vacated by Sen. Rob Portman (R), according to a poll released Tuesday. The Fox News poll shows Gibbons, an investment banker, leading the field with 22 percent support among GOP primary voters. Mandel, a former state treasurer, trails just behind with 20 percent, a difference that falls within the survey’s margin of error. “Hillbilly Elegy” author JD Vance is in third with 11 percent, followed by former Ohio GOP Chair Jane Timken at 9 percent and...