 Use J.D. Vance's words against Donald Trump, and that's probably the most significant liability. In fact, Nate Silver, who's given Trump about a 66% chance of winning, has said J.D. Vance is probably the one vice presidential pick who could actually make the Democrats competitive again. Could that, a lot of times, someone's strength is their weakness and vice versa. Could that change of heart be a strength for J.D. Vance on the campaign trail?