 Tradition. The walkthrough. All the speakers get a walkthrough of the stage. In this case, this guy's getting a lot of attention. The 39-year-old senator from Ohio, as Trump's running mate, is gathering a storm of photographers and reporters crowding the stage. Doesn't normally look like this during the day, during a walkthrough. Lots of buzz about J.D. Vance as the selection. Of course, it'll be hotly debated for years.