 Donald Trump announcing that 39-year-old Senator J.D. Vance of Ohio is his 2024 running mate. ABC's Rachel Scott on the convention floor. Senator J.D. Vance's name already being added to the campaign plane right under Donald Trump's name. And here on the convention floor, you have delegates taking out their Sharpies and pens and writing in Senator J.D. Vance on their Trump campaign posters. As for the Trump campaign, they are hoping that Senator Vance...