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Bernie Sanders's insurgent presidential campaign has opened up a debate about how social change happens in our society. The official version of how progress is won -- currently voiced by mainstream pundits and members of a spooked Democratic Party establishment -- goes something like this: politics is a tricky business, gains coming through the work of pragmatic insiders who know how to maneuver within the system. In order to get things done, you have to play the game, be realistic, and accept the established limits of debate in Washington, D.C.
