Wisconsin Gov. Scott Walker AP /Jacquelyn Martin and former Texas Governor Rick Perry.

Anyone who attended one of Bernie Sanders’ rallies during the Democratic primary campaign knows what the central issue was behind his call for “political revolution.” There was one unifying factor that drove Sanders’ unexpected groundswell of support, and that crystallized all the themes of economic inequality and social injustice he repeated in stump speech after stump speech. Not by coincidence, it was also the most prominent issue on which Hillary Clinton ultimately felt compelled to move almost all the way to Sanders’ position, after repeatedly insisting that she disagreed with him. That issue was the cost of a college degree, perhaps the most visible symptom of a far-reaching attempt by the super-rich and their ideological allies to reshape public education to serve their interests.