New Jersey Sen. Cory Booker is officially running for president . Booker, 49, is the former mayor of Newark, New Jersey, who has championed measures to address criminal justice issues, reduce racial and economic inequality, and legalize marijuana. He leaned heavily into themes of social, racial, and economic justice in an announcement video sent to supporters on Friday, the same day as the start of Black History Month. I’m running for president. Join me on this journey.