Mitt Romney typically plays nice with presidential rival Herman Cain. But at a town hall here on the eve of Tuesday’s presidential debate, Romney managed to slip in a subtle swipe. Romney drew a contrast between his resume, which includes four years as governor of Massachusetts, and Cain’s, which does not include elected office. After talking about his experience going from Bain Capital to the governor’s mansion, Romney suggested that Cain was, perhaps, not quite as ready as he is for the Oval Office. “I was able to find ways to use my skills in a public sector setting, probably...