South Carolina debate watchers most impressed by Sanders and Biden

It was a debate that viewers said brought clarity, but in which most viewers said the candidates spent more time criticizing each other than making the case for themselves. And Democratic debate viewers said national front-runner Bernie Sanders impressed them the most of any candidate, followed closely by Joe Biden and then Elizabeth Warren. CONT.

Jennifer De Pinto, Fred Backus, Kabir Khanna & Anthony Salvanto, CBS News