Democrats care as little for poor and middle class whites as the Republicans do. Poor and middle class have two choices; support the political party that panders to them but doesnt care(republicans) or vote for the party that openly scorns them and passses legislation against their interests(democrats). Not much of a choice.
that must be why Obama and some Dems are pushing for higher minimum wage
that must be why Dems kept pushing to extend unemployment benefit
that must be why Dems pushed to pass the ACA and expansion of Medicare
All legislation that goes against the interests of the poor and middle class