Mamdani wins in New York and takes the fight to Trump

This time last year, no one had really heard of him. Now, Zohran Mamdani is the first Muslim, millennial and person of south Asian heritage to run America’s largest city. Jonathan Freedland speaks to Ed Pilkington about Mamdani’s historic win, his challenge to the president, and what the Democrats should take away from a successful night at the ballot box