Why the kerfuffle over DNC voter information matters

Sen. Bernie Sanders and Hillary Clinton addressed the Sanders’ campaign breach of DNC voter data during the third Democratic debate. Amy Walter of The Cook Political Report and Tamara Keith of NPR join Gwen Ifill to discuss why Martin O’Malley hasn’t gained much campaign traction, political divisions on regime change in Syria, plus a farewell to Sen. Lindsey Graham’s 2016 campaign.