 CBS News special report. A couple of surprises at the start of the Republican National Convention. I plan to be a very good vice president for Donald Trump for four years. That's 39-year-old Ohio Senator J.D. Vance, Mr. Trump's choice for a running mate. Vance didn't find out he'd been picked until 20 minutes before. CBS's Caitlin Huey Burns. Vance was one of the first senators to endorse Trump's 2024 bid and has become a top surrogate and fundraiser on the campaign trails.