On a rainy Sunday evening in May, Kuber Sancho Persad found himself in an unusual place for a New York taxi driver: standing in line outside a popular concert venue in Brooklyn. The venue was familiar territory for twentysomethings heading to indie shows, not for working immigrants like Persad. But this was not a concert. Persad was there to attend 33-year-old Zohran Mamdani’s first major campaign rally in his bid to become the mayor of New York. Mamdani is competing for the Democratic Party nomination in the party “primary” on June 24 – effectively the main contest in a city...