Nevertheless, Mr. Obama is right. Identity politics is a fundamentally undemocratic phenomenon. It assumes that vast numbers of individual human beings can be reduced to the color of their skin, their gender or their sexual orientation. Diversity among different "kinds" of people is celebrated everywhere, but intellectual, ideological and political diversity among those groups is demonized. The idea that all I need to know about someone is the color of their skin -- white or black -- strips individuals of their individuality and their agency.