Only on the “CBS This Morning” podcast, Dr. Jill Biden discusses her husband, former Vice President Joe Biden's, 2020 presidential campaign and her new book, "Where the Light Enters: Building a Family, Discovering Myself," with co-host Gayle King. Dr. Biden explains the conversation the family had before Biden announced his candidacy, the current political climate and why teaching remains an essential part of her life. She also shares how as a young registered Republican voter, she fell for the Democratic senator from Delaware — plus, the hilarious prank she played aboard Air Force Two.