We recently saw a screening of " Mandela: Long Walk to Freedom ," the Nelson Mandela biopic starring Idris Elba as the beloved "Madiba" and Naomie Harris as his wife and partner in revolution, Winnie. The film is a riveting testament to the irrepressible spirit of Mr. Mandela, who was sentenced to life in prison in 1964 because of his "terrorist" involvement with the anti-apartheid organization, the African National Congress (ANC). Mr. Mandela served 27 years of that sentence, mostly in a tiny cell on Robben Island. When he was released in 1990, he got even not by urging his supporters to wage war against his white oppressors, but by becoming South Africa's first black president in 1994. Idris Elba and Naomie Harris as Nelson and Winnie Mandela in "Long Walk to Freedom,."/Photos courtesy of the film. His is an impossibly true story, and one that is particularly poignant since the human rights activist passed away yesterday at age 95...