Reflecting on the cultural rejection underlying your, DU's, and the Dem Party's defeats and current futility would be useful, but that would entail having to admit having been wrong.
Hint: Telling people they are evil because of the color of their skin and using their reproductive plumbing as designed is not a winning message. Nor is blaming people for something that ended 160 years ago.
Dems' failure not that they have failed to communicate their message, but that their message has been heard, understood, and rejected.