In a stunning upset, 33-year-old Zohran Mamdani won the Democratic primary for New York City mayor. Final results won't be official for several days, but his win has sent shockwaves through the Democratic Party. To discuss Mamdani's win and what comes next, PBS News' Amna Nawaz spoke with Errol Lewis, political anchor for Spectrum News NY1 and host of the Inside City Hall program.