I'm not saying yankess or Bernie created socialism. I'm saying Bernie's socialist ideas don't sell well in the South, not even with other democrats.
I'm getting more and more cynical, and I'm thinking that elections are not merely decided by undecided/moderate voters, nor are they decided by low-information voters, but instead are decided by
undecided/moderate-low-information-voters UMLIV's.
The primaries by their nature are usually more ideological and higher information than the general election actually is. And while he's not gotten a majority, and the plurality of all the other candidates combined has outdone him still... Bernie has been pulling down wins because of his platform being a reactionary equivalent on the Left. (Reactionary is usually a label for the Right, but we know that's because the Left likes to twist language to their ends, and of course being honest, there's a reactionary Left too..)
However, some states will just go by the optics, (face, speech, smile, delivery...) of which Biden's are infinitely better than Bernies, and I think that in some states and some demographics, the optics are of increased importance.