LIMA, Ohio—When he was running for Senate four years ago as a candidate mostly known for his best-selling book, “Hillbilly Elegy,” JD Vance recalls speaking in front of groups as small as a dozen trying to earn Ohioans’ votes.
Many of his travels took him to northwest Ohio, a region defined by flat landscapes and small towns dotted with farms and tall-steepled churches.
On June 24, he returned to the area where he delivered the keynote address at an Ohio Republican Party dinner in Lima. A crowd of 1,000 gathered at the Veterans Memorial Civic & Convention Center to hear the vice president....