 Harris is by far the favorite, right? I don't know if he would actively endorse her or just kind of signal that he thinks she's great, but she's either way the favorite to win any convention. He could actively endorse her and functionally hand her the nomination. Hell, he could resign and hand her the presidency. But she'd have to do something very tricky, which is usually when a vice president runs, they have a whole campaign to redefine themselves. Joe Biden had the entire 2020 campaign redefined.