The DNC will parachute in someone new right before the deadline.
Someone that everyone on the Left can get behind.
Right now all these clowns are just wasting time and being the fools they are so that when this new person drops in, the Left will be all gung ho about supporting them, and some in the middle to.

Someone like Mark Cuban who has hinted at politics in the past, and would be the Liberal equivalent of Trump.
Right now, none of these candidates are serious. They are all just wasting time.