I am not making any personal accusations, have no 'dog' in the fight for which Democrat will lose to Donald Trump in 2020.
Washington, DC will vote for any name, or even a blank, for Democrat, and she or he will get, guaranteed, alive or dead, at least 3 Electoral Votes, no matter any other reality.
Whether you wither the ranks down to Biden, or Warren, or Francis J. O'Roark or whatever other name he wants on the ballot, or is allowed to be called on TV by that time, or any of the more crackpot leftwing folks, or even Bernie, or even Hillary, matters not to me personally, and you must know that each and every one of them will be fully vetted during the Election cycle, based upon their own history or lack of history.
Matters not what I or any other Trump supporter thinks or believes about any one of them, not one wit. You will do this to and among yourselves, I am sure.
Personal attacks may have worked, back when the majority of us were being civil, to deflect and prevent public knowledge about Candidates...and that is no longer the case. You will not deter with personal attacks, any viable 'news' about any one of your supposed 'qualified' Candidates... there will not matter to whom CNN gives the debate questions in advance, and no honor among thieves is presumed, in todays politics, and expected.
My suggestion is you should be prepared for what will come, and presume all will become known about each and every one of them, prior to selection in your Primary, and certainly before November 2020, when Americans, and those who Democrats connive to get ballot access, go to the Polls.
Please choose carefully, for the Nation's sake. Thank you, all of you, even those among you who deserve no gratitude or consideration at all.