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Even after a charged, protracted Democratic primary season that revealed deep philosophical fractures in the party, Hillary’s willingness to cater to actors on her left remains minimal. Accordingly, the historic Sanders delegate walkout is emblematic of what should now be obvious: there is a level of hostility toward Hillary among activist-minded progressives that never existed toward Barack Obama in 2008 or 2012. For one thing, the composition of the party has changed dramatically over eight years. Ideological progressives, who in 2008 yearned principally for emancipation from the…