 ABC News national correspondent Stephen Portnoy is there. News of Donald Trump's choice of J.D. Vance energized the convention floor. Tracy Sanchez is a delegate from Ohio. Come from grassroots all the way up. I mean, he gets all of us people, middle class, low class, it doesn't matter. He's a man to understand. At age 39, the first term senator would be the youngest vice president since Richard Nixon was elected in 1952.