The trailblazing women behind 50 years of success at NPR

A new book, "Susan, Linda, Nina & Cokie: The Extraordinary Story of the Founding Mothers of NPR" explores the careers and friendships of trailblazing journalists Susan Stamberg, Linda Wertheimer, Nina Totenberg and Cokie Roberts. For NPR's 50th anniversary, Judy Woodruff spoke with author Lisa Napoli and Susan Stamberg about how women turned NPR into one of the U.S.'s most popular media outlets.