Even the unions have not been voting Democratic, much less socialist.
Union workers are often better paid than their counterparts in non-union states. Relatively well off comparatively and often invested in preserving the status quo to stay that way.
And what exactly do you mean when you say socialism?
A living wage, healthcare and education. That's what Democratic Socialists want. That's also what unions want.
But do union members want everyone to have all those goodies? Nope...that would drive up prices. And taxes...
Unions are a thing of the past, just like Joe Biden. A social democracy makes them obsolete because everyone is paid union scale
as per government regulation. Everybody gets "union benefits" as per government regulation.