Kate Mara knew she wanted to be an actress since the age of 9—and 30 years later she still treasures the job. "The magic is still very much there for me," she said on "Salon Talks." In this interview, Mara talks about the dark, secretive roles that have defined her career—such as the scorned lover turned vindictive ghost on "American Horror Story," a calculating, ambitious reporter on "House of Cards" and a predatory educator on "A Teacher." And Mara talks about her latest role as an FBI agent in FX's "Class of '09," opposite Brian Tyree Henry, and how she shakes off dark roles at the end of the day.