Writing for The Establishment:

As this election progresses, I hear with increasing frequency this lament of liberal elites: The left will eat itself. Cries of concern are usually focused on people like me, people who are marginalized: the loud and disenfranchised, the uncompromising and unforgiving, the brown, the queer, the poor, the disabled. We are never satisfied. We sacrifice the greater good for our own selfish needs. We are distracting the left from their mission. We are dividing the party. We are creating a quagmire. We are the regressive left. We are the illiberal left. We are the new dictators. We are why the left eats itself.

Go read the whole thing—especially if you're a comfortably middle-class liberal, or if you read about the recent Seattle University protests and thought to yourself, "You know, those students are going too far." Or if you want everyone on the left to fall in line behind Hillary Clinton, Bernie Sanders, or any particular politician:

Your place at the front of a movement is not grandfathered in because the leaders of the past have always looked and sounded like you. By definition, progressives move forward, and we should not let the pace of that movement be set by those who like to sit and rest at the stops that meet their goals.