In contrast to the scattered, angry, erratic, openly demagogic man at the top of the ticket, Sen. J.D. Vance was calm and clear and presentable in Tuesday night’s debate against Gov. Tim Walz, Kamala Harris’ choice to be a heartbeat away from the presidency. Vance probably even won on points, if you judge these things like a high school debate meet; Walz served up a few word salads.