text:  Live from NPR News in Washington, I'm Shea Stevens. Former President Donald Trump has chosen U.S. Senator J.D. Vance as his running mate. Vance is a 39-year-old first-term senator from Ohio who gained national attention through his best-selling memoir, Hillbilly Elegy. He's a former Trump critic who's now one of the Republican presidential nominee's staunchest supporters. I have absolutely got to thank the 45th