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"You have correctly pointed out that the working class doesn't have much money anymore. I congratulate you upon your cleverness and also your astute suggestion that politicians should pander to people with money. To hell with the working class!"
While I assume you understood my point before you grossly misrepresented it, allow me to rephrase:
White working class people don't represent the totality of the Democratic party or progressive movement. Also, is self-defeating for Democrats or progressives to disparage other demographics for the purpose of elevating this group. Case in point, Obama's coalition is successful despite his apparent difficulty in prying white working class voters from Clinton. Perhaps her supporters should ask themselves whether her reliance on white working class voters (often to the extent of insulting other demographic groups) may pose its own general election liability.