J.D. Vance had an assignment. For months, the Republican vice presidential nominee has been dogged by controversies: from the resurfacing of his three-year-old remarks complaining about “childless cat ladies” to his spreading the baseless claim that Haitian migrants are eating people’s pets. Vance’s deliberate provocations have endeared him to Donald Trump but haven’t shown signs of resonating with the non-MAGA segment of the electorate.