I would laugh my ass off if the Democrats were stupid enough to nominate Hillary Clinton for POTUS in 2020. Of course, they were stupid enough to do it in 2016. 8 years to come up with a viable candidate and they couldn't do it.
From articles I've read, the top Democratic possibilities are Sanders, Warren, Biden, Harris, Gillibrand, and Booker. Clinton not even mentioned. Here is one article on the subject:
https://www.dailydot.com/layer8/2020...ion-democrats/