Colman Domingo stars in two big films this year, in very different roles. In "Rustin," he plays the civil rights leader Bayard Rustin. In the new musical adaptation of "The Color Purple" he plays Mister, a cruel and abusive husband. "I think as artists, as actors, we are always watching," Domingo tells Terry Gross. "We're watching heroes. We're watching ordinary people do extraordinary things every single day. We're watching horrible people do terrible things and be committed to it. ... For me, I didn't build outside of myself, modeling on somebody who did some vicious things or abusers. I have to look within."