Jim Sleeper, author and lecturer in political science at Yale University, argues that party elites have created Bernie Sanders and Donald Trump, and Trump's popularity exposes a "vacuum" in American political discourse.

Sleeper said there's a need to "rattle the cage of the establishment," especially in the Democratic party.

But that shouldn't mean that anything goes.

Sleeper also made a point about the so-called elites who look down their noses at Trump supporters: "We’ve used our classism to condemn their racism…without understanding that we were contributing to the sense of alienation and dispossession with our own disdain."