When I read that this new biopic (full title is Mandela: Long Walk to Freedom) would feature an original song from U2, I was expecting something a bit worthy and earnest (with a cameo from Oprah Winfrey, perhaps?). Call me surprised and impressed, then, that judging by this trailer, the film will not focus exclusively on Mandela's saintliness, but depicts him as a principled but practical political actor who loses faith with the non-violent approach to political change.