They sure as hell won't do this before the election.
And after the election, if Trump wins, who knows. He won't have to worry about pleasing the base any more, so things could get interesting.
Four years and you, the far left, have yet to catch on.
Unlike Democrats who pigeon hole their base into little cubicles, then they formulate appeals to each which they drag out every four years in personal appeals to each group. They believe that "everyone" does it that way, which may have been true until Donald Trump came along.
Donald Trump just came forward with common sense and a sincere presentation. Then he's just gone out and done the job, successfully. The Democrats just can't figure out how to counter sincerity!