Don Cheadle finally grabs himself a full-fledged starring role. Aside from 2004's Hotel Rwanda, the actor has been more or less content to settle for quality second banana roles. Here, he takes the bull by the horns as real-life Washington, D.C. radio personality Ralph "Petey" Greene, an ex-con who became a popular talk show host and community activist in the '60s and '70s. The film is a robust mixture of humor and drama. Director Kasi Lemmons (Eve's Bayou) gives the film the all-too-familiar rise-and-fall arc of so many biopics, but the performances (including a great one by Chiwetel Ejiofor) are worth the price of admission. 118 minutes R.