[simonw]

That's a different issue. Presidental succession says who replaces Biden if he dies in office, but the question here is who would stand as the Democratic candidate for the 2024 election if he died.

Harris would be likely, but maybe not a 100% certainty.

[laidoffamazon]

The edge cases are people like Pritzker or Newsom, not Michelle Obama who has repeatedly said she would never run for office.