Hillary at this point will lose. They will have to switch her out. Bernie would be more fair. He campaigned. Bernie against Trump is a fair fight. Two not owned candidates, each with a particular ideology. It would be an honest engagement, were it not for the oligarchy who would be desperately trying to own one or both and fast.
The dem establishment will never let it be Bernie, he is not one of them and under their control. They are already floating Biden but they can not do that either as it will be all out war in their base coming from the Bernie voters and they will not just lose it will be a slaughter.
They are stuck with Hillary until the last vote is cast then she can drop.
Bernie would be fair. Biden would be unfair. They’ll go with Biden.