Mark Lilla is a committed  Democrat who admonishes his party for the its descent into Identity Politics in The Once and Future Liberal- After Identity Politics 

What replaces argument, then, is taboo. At times our more privileged campuses can seem stuck in the world of archaic religion. Only those with an approved identity status are, like shamans, allowed to speak on certain matters. Particular groups—today the transgendered—are given temporary totemic significance. Scapegoats—today conservative political speakers—are duly designated and run off campus in a purging ritual. Propositions become pure or impure, not true or false. And not only propositions but simple words. Left identitarians who think of themselves as radical creatures, contesting this and transgressing that, have become like buttoned-up Protestant schoolmarms when it comes to the English language, parsing every conversation for immodest locutions and rapping the knuckles of those who inadvertently use them.

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