By Andy Silvester Donald Trump’s new vice presidential candidate is quite the man. A well-regarded author who became a liberal darling as the man who could explain Trumpism to city dwellers, he later warned that his new boss would become an “American Hitler.” Now he’s on the march as his number two. Funny old world. For all of JD Vance’s uniqueness, he is not a new archetype in American politics. In one particular way, he leans into one of the country’s ever-present and least-appealing strands of thought; that of extreme, almost aggressive, isolationism. That isolationist streak almost lost Wo…