 You can hear them there chanting, fight, fight, fight, as Mr. Trump walked through the crowd, visibly emotional, with a large white bandage over his right ear. And those words, fight, fight, fight, of course, was what he said to the crowd just seconds after he was shot on Saturday. Well, Mr. Trump ended up being the focal point of the evening, but perhaps the wider political significance was his choice of running mate and vice presidential candidate.