The Democratic establishment dealt a crushing blow to the progressive movement this week in Ohio, where tensions, bad blood and intraparty allegiances were on full display. What can we learn from a special congressional primary that quickly became a national spectacle? And what does it say about the direction of one of the most powerful political forces in Washington: the Congressional Black Caucus? POLITICO's Ally Mutnick performs an autopsy with Playbook co-author Ryan Lizza.