I was contemplating making a fresh post on this subject, but it'd go ignored while we rehash the latest offense from the GOP/Trump.
Anyway, I'm convinced that the largest challenge facing the Democratic party (truly, the country) is the failure of our shared beliefs in core fundamental truths PAIRED with relatively high political engagement by low information participants. It's like the Democrats have been pushing DEMOCRACY and expanded voting since the civil rights era, but the voters weren't sufficiently educated so that they make good choices.
Lost in all of the abundance agenda, let's focus on populist economics, the Democratic leadership is too old, etc. conversation is that basic challenge, and it'll begat just more change elections unless the Democrats can sufficiently combat the disinformation so prevalent in the Fox sphere, social media, etc., or they need to just concede that governance by an enlightened few is preferable, if undemocratic.