Women's Rights Pioneers Win Nobel Peace Prize

The 2011 Nobel Peace Prize winners were named Friday: Yemeni activist Tawakkul Karman, Liberian president Ellen Johnson Sirleaf and Liberian activist and author Leymah Gbowee. Michel Martin discusses the winners and meaning of the prize with Kristian Berg Harpviken, who follows the Nobel Committee's process closely and directs the Peace Research Institute in Oslo.