It is hard to say. We do know that key elements of Sanders-ism didn't do well. In Colorado single-payer healthcare (essentially Sanders-care and something Sanders endorsed and campaigned for) was defeated by 60 points. And in California Sanders campaigned hard for Prop 51 to lower drug pricing (by setting CA prices to US VA pricing) lost by 8 points. California did pass a non-binding law against Citizens United (another signature Sanders issue) but that passed by less than 5% (significantly under-performing Clinton in CA).
Proposition voting tends to go differently than partisan races, though. In 1998, California's Prop. 227 got 61% of the vote, and then last night Prop. 58 repealed much of it with 72% of the vote. You can't explain that with some simple partisan model.
