The Sanders presidential primary run is quickly becoming the most significant progressive/left challenge to “establishment politics and economics,” to use Bernie’s words, in the past 30 or so years.
This doesn’t take away from the significance of other past or present social protest movements. Nor is it a guarantee that it will last beyond the present election cycle. It still remains to be seen if it will acquire the vision and capacity to capture the imagination of tens of millions, especially our very diverse working class, people of color, and women, as well as challenge over the longer run the dominance of the billionaire class.