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Photo illustration: Brendan Lynch/Axios. Photos: John Lamparski and Alex Kent/Getty Images, Selcuk Acar/Anadolu via Getty Images and Christian Monterrosa/Bloomberg via Getty Images

Young progressive Zohran Mamdani's historic upset in the New York City Democratic mayoral primary was made possible by a confluence of factors that have left his fans in a fever-dream state Wednesday and his enemies ready to pounce.

Why it matters: No matter where you stand on the self-proclaimed democratic socialist, Mamdani's success offers a playbook to a disillusioned Democratic party whose establishment didn't back him.