There is a deep division between the Moderates in the DP and the reactionaries, Biden was the moderate choice because he is weak and can be manipulated. He also has a spotty record insofar as honesty is concerned and would not act against the crooks in the DP.
Biden is now going down faster than a jetliner and his raising of money for the election campaign is dwindling, He raised $15 million in the last quarter against the S25 million raised by Sanders and $19 million raised by Warden. This is miniscule compared to the $125 million raised by Trump in the same quarter, After the DP started with the Ukraine Hoax the RP raised $15 million in one day,
In the meantime Sanders had a heart attack and I do not think he would make it through to the election next year. He is also hopping mad now that he realized how the DP crooked to get Clinton in as candidate. Hs support is from the leftists and if he bows out his supporters will go to Warden.
The latter has also an honesty problem - she lied to get into University and it now comes out she lied about her teaching career too. There is no doubt that there would be other skeletons in the Warden cupboard that would come out too in an election campaign.
The DP is panicking and now the leftists are mentioning the name of Mrs Obama - but whether she will make the ideal candidate is not sure at all.