The reason that so many working-class people haven't already pledged their allegiance to Socialism is that it claims to be the voice of the Lowest of the Low, and most working-class people have struggled their whole lives to not BE the Lowest of the Low.
The working-class dream is to rise into better circumstances than they presently endure, and Socialism tells them its an illusion, a game that can't be won, at least not by dirty little people like them. When this news is delivered by middle-class theoreticians it's always seen as condescending.
One has to have a dream that runs contrary to experience in order to yearn for Socialism. An example of this is the movie Annie Hall, when Woody Allen visits his parents in their miserable home beneath the roller-coaster in Coney Island. Mom has just fired the cleaning lady for stealing, but Dad angrily defends the cleaning lady, declaring, "Who should she steal from, if not from Us?!"
That is the relationship between the working-class and Socialism. I wonder who Dad is voting-for this year.