Well, if Joe goes down to defeat, there will be lots of infighting in the Democrat party. Among those battles will be over procedures for choosing nominees.
If we recall, Joe Biden finished 3rd or 4th, I think, far behind in the New Hampshire primary. His campaign seemed to be on life support. Joe got key endorsements on the eve of the South Carolina primary. He won big in that state, which revived his campaign. And at the same time, many other Democrats decided to drop out, which left Joe as the last man standing against Bernie Sanders. And then Sanders dropped out soon after that.
Joe won this nomination because he was the last man standing, not because he was the most popular or the best candidate.
If Joe loses, all of this will be hashed over by the Democrats as they cry about four more years of Trump.
-PJ