I don't see the value of the "both sides" argument. I think vote blue no matter who may have the value of shifting the overton window. But the reality is many of the people on the far left are just non voters making post hoc rationalizations. So I don't really care about their opinion.
It's actually really simple. The coalition required to reform the government includes the right and republicans. They actually vote. Really we should be looking at the tactics used to convert people from the progressive era.
In this way you avoid counterfactual arguments and actually have a path to follow. As opposed to feeling like you have some magical solution if only you were president.