NFL's Secret Weapon: How Fullbacks Made a Comeback

NFL fullbacks are some of the hardest-working and most beloved players in the sport, but they've struggled to find success in the spotlight. This season, things are different. FiveThirtyEight's Josh Hermsmeyer joins Mina Kimes to explore how fullbacks are having their best year ever, and why they've been the key to success for football offenses.