The wisdom of Donald Trump picking Sen. J.D. Vance as his 2024 running mate was on full display Wednesday. The former president could never have known when he tapped the Marine Corps combat veteran back in mid-July that prior military service would become such an important issue. On Tuesday, Vice President Kamala Harris announced that Minnesota Gov. Tim Walz is her running mate, and a significant element of his resume is that he is a National Guard veteran. So, in theory, he should have the ability to draw patriotic swing voters to the ticket. Harris placed Walz’s military service front and ce…