Conventional wisdom is that
owes an enormous debt of gratitude to Rep. Jim Clyburn. Clyburn's endorsement in South Carolina is believed to be what put Biden over the top, which begat Super Tuesday, which begat Super TWOsday, which begat Biden being the presumptive nominee. One can argue that
also owes Clyburn a debt of gratitude for making Biden the nominee. But that's a post for a different time.
Congressman Clyburn is The Man. And according to The Man, the DNC should cancel all remaining debates. There's too much risk of Biden embarrassing himself.