 Rachel, thank you. The two candidates have had very different ways of getting ready for tonight, one going the more relaxed way, at least that's how he's explained it, the other going more traditional and formal. ABC's Karen Travers watching how President Biden has been preparing. Karen, good evening. Good evening, Alex. President Biden spent nearly a week hunkered down at Camp David, the presidential retreat in the mountains of Maryland, with his senior advisors from the campaign and the White House. We're told he was doing policy review sessions. He was working on memorable lines.