Since his surprise victory in the Democratic Party primary in June, New Yorkers have become used to seeing his bearded, smiling face on television -- and on badges proudly worn by his young supporters. The 34-year-old election frontrunner was born in Uganda to a family of Indian origin and has lived in the United States since he was seven, becoming a naturalized US citizen in 2018. He is the son of filmmaker Mira Nair ("Monsoon Wedding," "Salaam Bombay!") and Mahmood Mamdani, a professor and respected Africa expert -- leading some of his detractors to call him a "nepo baby." He...