The Last Word with Lawrence O'Donnell 05/04/15

Republicans Fiorina & Carson enter 2016 race

What will two more Republican candidates - fmr. Hewlett-Packard CEO Carly Fiorina and heart surgeon Ben Carson - mean for 2016? Lawrence talks w/ fmr. Gov. Howard Dean (D-Vt.), GOP strategist Steve Schmidt, & Washington Post columnist Jonathan Capehart. ... more Duration: {{video.duration.momentjs}}