A) I’m talking about who is next in line of succession, not the nomination. If Biden’s cabinet declares him unfit for office, Harris will become the President, but she doesn’t have to be the nominee. B) Actually, she doesn’t. Her approval is in a statistical tie with Biden’s, while her disapproval is much lower. I’m not saying she’s the best option (her numbers are about the same or worse than a lot of other potential candidates), but pretty much everyone’s polls are looking a little better than Biden’s now, and his are still going down.