R. Emmett Tyrell Jr. does an excellent job writing the coroner’s report in this WSJ piece.
When your guiding lights are the Fabian Socialists of Great Britain and/or Karl Marx, you know you’ve got trouble. The other issue not mentioned in Tyrell’s article is the demographic time bomb the liberals/progressives (take your pick) currently face. Their birth rate is significantly lower than conservatives and has been for a generation. One more generation and it will be lights out. Fringe status awaits!