History warns us to be very, very careful when using the phrase "white working class." The reason has nothing to do with political correctness. Rather, it concerns the changing historical definitions of who is "white."
Eduardo Porter in the New York Times uses this construction to ask, "Did the white working class vote its economic interests?" He claims that current data shows white people losing out to blacks and Hispanics in getting their fair share of the new jobs created since 2007: