The Dems, behind the scenes, are setting up the fundraising and organization for another candidate. The media can shill all they want for Hillary but the party insiders are done with her, and are looking for and grooming her replacement.
Valerie Jarrett doesn’t want to give up her ‘de facto President’ position.
If Hillary runs and loses, VJ is out.
If Hillary runs and wins, VJ is out.
Warren is VJ’s candidate. They already had a pow-wow and the deal was probably made then.