It is interesting, if you would spend a few minutes, to imagine if Trump had run as a Democrat and won. Would all the Dems be lining up behind him, spooning up his errata and reinterpreting for any journalist who would listen?
I don't think so. Worthy exercise to contemplate, though.
Dems never march in lockstep, but it's natural for Republicans to do so. One of the reasons they're formidable opponents, but it is also a great weakness if leveraged properly. Yet the DNC has been aware of this for decades and, like the last campaign, been largely impotent.
The best recommendation: whatever you've been doing, DNC, do the opposite next time. Can't be any worse.