Look at the Michigan county-by-county primary results (better yet: compare 2020 to 2016) and tell me that Democratic Socialism is a viable position in the modern Democratic party. Sanders didn't even take Washtenaw this go-round. I think it's very likely that Sanders overperformance in 2016 was really an artifact for a lot of deep-seated dislike and distrust of Hillary Clinton (something Biden himself was reported sour about in the wake of the 2016 fiasco).

Corporate opposition is a just-so story. Until his campaign fell apart, Sanders stomped Biden in earned media coverage.