Alexandria Ocasio-Cortez struck a dissonant note in an otherwise well-orchestrated second night of the Democratic National Convention. The freshman congresswoman's highly anticipated speech was devoted to seconding Bernie Sanders's nomination. Where much of the programming celebrated the geographic and population diversity of America, Ocasio-Cortez impugned American society for its misogyny, racism, and colonization. She said it was Sanders, not his rivals, who could lead the country out of its overlapping social, economic, and health crises. Unlike Sanders, however, Ocasio-Cortez said hardly a word about the actual Democratic nominee. On Monday, Sanders urged his movement to back Biden in November. On Tuesday, we learned why he felt it was necessary to be so emphatic. The reason is voters like Ocasio-Cortez.