As someone aptly put it on twitter (Nate Cohn), the "white working class" is voting like a minority block--and why would they not? The elites have ignored the working class (white and black) for ages and when they do think of them, white (and other) elites look down at them with the contempt of 'white privilege' while they, the elite whites, sit comfortably in their protected perches rarely exposing themselves to insecurity.

It's possible this is a consequence of overplaying identity politics used to try and counterbalance Trump's followers' politics. In other words the working class had their identity unintentially forged in the scrum of identity politics.