The line outside the Apollo Theatre on Wednesday morning snaked along 125th Street and up Frederick Douglass Boulevard, before curling onto 126th. “The next President is going to be here: we love her!” Fanta Kouyate, a child-services worker who had come across the Harlem River from the Bronx, volunteered. “I wouldn’t miss it for the world,” Harriet Natkin, an Upper West Side resident who had come with a couple of friends, said. “I’m a very big Hillary supporter.”