Why Angelina Jolie Decided to Undergo Preventative Double Mastectomy

In a New York Times op-ed, actress Angelina Jolie disclosed she had a preventative double mastectomy because she carries a greater genetic risk of developing breast cancer. Gwen Ifill talks with genetic counselor Beth Peshkin of Georgetown University and Dr. Kenneth Offit of Memorial Sloan-Kettering Center in New York.