text:  In the Reagan time and the George W. Bush time, that American credit is important, that America's word matters, and America's cause is just, and its allies should be protected. So do you think ultimately it's ambition that drives J.D. Vance? It's ambition that defines J.D. Vance? I think that that's true of a lot of people in politics. But the question, when I've had a chance to interview politicians, I always ask them is, what is...