The Last Word with Lawrence O'Donnell 10/08/15

Fmr. Newtown teacher responds to Ben Carson

In her book 'Choosing Hope,' former Sandy Hook Elementary School teacher Kaitlin Roig-DeBellis describes how she hid her first graders in a bathroom during the Newtown school shooting. She also joins Ari Melber reacting to Ben Carson's comments on arming teachers. ... more Duration: {{video.duration.momentjs}}