Leonard Pitts Jr.: J.D. Vance gives substance and dimension to America’s invisibleLeonard Pitts, Jr., Miami Herald columnist, Aug 30, 2016 “Hillbilly Elegy,” the new best-seller by J.D. Vance, is, in a very real sense, about Donald Trump. More to the point, it’s about the people who have made his unlikely run for the presidency possible.