Conservatives sure are afraid of Congresswoman Alexandria Ocasio-Cortez. They don’t like that she danced in college, they’re in an uproar over an old high school nickname — some are even spreading a false rumor about a nude photo. The Republican, mostly male obsession with the 29-year-old Bronx native is more than run-of-the-mill misogyny; it’s existential panic. Because in addition to the young Democratic Socialist standing for (reasonable) policies that conservatives find terrifying, Ocasio-Cortez represents a vision of the future of the United States — a future that’s no longer centered around old white men. The newest class of political representatives are more diverse than...