WASHINGTON — It’s official. Cory Booker has a girlfriend. The Democratic senator from New Jersey and 2020 presidential candidate made the revelation on a morning radio show on New York City’s WWPR-FM, known as Power 105.1. “I got a boo,” Booker said. Booker’s social life has been the focus of attention for years, and he has been linked to several women on the gossip pages, including Chanda Gibson, executive director of the Council of Urban Professionals; Instagram poet Cleo Wade; actress and author Mindy Kaling; and, most recently, actress Rosario Dawson. “Before I declared for president, I’m dating somebody that...