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

 The only adversary left is ourselves. And we have mastered the art of self-sabotage. At a time when we liberals need to speak in a way that convinces people from very different walks of life, in every part of the country, that they share a common destiny and need to stand together, our rhetoric encourages self-righteous narcissism. At a moment when political consciousness and strategizing need to be developed, we are expending our energies on symbolic dramas over identity. At a time when it is crucial to direct our efforts into seizing institutional power by winning elections, we dissipate them in expressive movements indifferent to the effects they may have on the voting public. In an age when we need to educate young people to think of themselves as citizens with duties toward each other, we encourage them instead to descend into the rabbit hole of the self. The frustrating truth is that we have no political vision to offer the nation, and we are thinking and speaking and acting in ways guaranteed to prevent one from emerging.