JILL FILIPOVIC, LAWYER AND POLITICAL COLUMNIST: The party itself has been stuck in some old ideas for a while. You’ve been seeing movement around the edges, whether from Elizabeth Warren or these grassroots movements for income inequality. The pro-choice movement, for example, is a key part of the Democratic base that has liberalized and modernized and completely changed its messaging in a way that the party is now just catching up to. So you get these internal discords that dredge up a lot of bad feelings.

DANIELLE ALLEN, DIRECTOR OF THE EDMOND J. SAFRA CENTER FOR ETHICS AT HARVARD: In the last 20 years, we’ve collectively experienced various forms of social acceleration. Rates of change in social dynamics have increased across the spectrum, from income inequality to mass incarceration to immigration to the effects of globalization and the restructuring of the economy. When you have an acceleration of social transformation, there’s a lag problem. The reigning policy paradigms will be out of sync with the actual needs on the ground. That’s what we’re experiencing now.

JEDEDIAH PURDY: The people who have been drawn to the Sanders campaign have no love for or confidence in elites, Hillary’s habitus. And why should they? They’ve seen growing inequality and insecurity, the naked corruption of politics by oligarchic money, total cynicism in the political class of consultants and pundits, and wars so stupid and destructive that Trump can say as much and win the GOP primaries. There’s a whole world that people are surging to reject.