Melinda Gates on her mission to 'lift up women' worldwide

The Bill and Melinda Gates Foundation is the world's largest private philanthropic organization, with an endowment of $50 billion. Melinda Gates plays a huge role in shaping its work, and her new book, "The Moment of Lift: How Empowering Women Changes the World," chronicles some of the inspiring men and women she has met through it. Judy Woodruff talks to Gates about politics and equality.