Apparently the courts have ruled that political parties are private corporations and can do whatever they wish with their rules to operate their organization. A couple weeks back, someone pointed out that if a Dem candidate wins the Dem primary and subsequently backs out, then the Dem party can appoint a replacement of the Dem party committee's choosing. So, if Biden wins, then steps out just before election, they can shoe in Newsom or Michelle. That's my understanding anyways. They used similar internal corruption to kill Bernie using super delegates. They can't allow an usurper like RFK to win, or the optics of the last second change are bad. So they'll use superdelegates to get Biden a guaranteed primary win, then do their swap.