Alexandria Ocasio-Cortez greets a passerby in New York on Wednesday. Many top Democrats said they were surprised and shaken by Ocasio-Cortez’s defeat of Rep. Joe Crowley, one of their top leaders.

Alexandria Ocasio-Cortez greets a passerby in New York on Wednesday. Many top Democrats said they were surprised and shaken by Ocasio-Cortez’s defeat of Rep. Joe Crowley, one of their top leaders.