DUBLIN, Ohio — Robert Peters and George Fidelibus walked off the 18th green at the Golf Club of Dublin, then carried pints of beer to the patio overlooking the course, which was framed by $500,000 homes. Their conversation quickly turned to the president. “I’m feeling better and better about him all the time,” said Mr. Peters, 63, a retired engineer, who had once been cool to Mr. Trump. Mr. Fidelibus, 75, a retired banker in a Calloway hat, had also once been skeptical of the president’s bullying and lack of self-control. “I’m a supporter of Trump now,” he said “He...