Bernie Sanders ran as a socialist, and netted over 12,000,000 votes, according to realclearpolitics. This number is skewed downwards somewhat by the fact that he did better in caucus states. And according to the NYT page I had open in the background, around 120,000,000 voted in the general. Probably slightly more, because I just added the D and R votes together, but, still. Is roughly 10% of the electorate socialist? I don't think so, because I know a fair amount of Sanders supporters who are not. I only know a couple who would identify as such. I'm one of them. This is the same reason I don't think that all Trump supporters are fascists. Because I know a fair amount of them. A lot of them are people I have respected for years. Life is more complex than that.
I dunno. I think if you support fascist policies, you are a fascist. If you support socialist policies, you are a socialist.
By and large, people who voted for Sanders voted in the general, though. Stein only got 1% of the vote (admittedly with lesser ballot access) , and while you might be able to make an argument that she supports socialist policies, Johnson, Clinton, and Trump are firmly capitalist. Most of Sander's supporters have voted for someone who is socialist, and someone who is capitalist within the past year. That's a wild swing of policy support for them to make so quickly.