The narrative against him is his refusal to adopt better policies. He wants to be seen as supporting M4A but when it's all done and dusted, he doesn't. That alone will prevent me from giving him a second look. We must look to redistributive policies. If an M4A proposal has flaws, for instance, the discussion needs to be focused 100% on closing those specific gaps. Because the problem is poor distribution of wealth and resources and no sign this will change without intervention.
In my opinion a candidate must at bare minimum correctly identify issues and not be afraid to name the unbridled solutions.