The contest in South Carolina looks very different heading into its final week than it did last fall. Joe Biden (28%) has only a single-digit lead with Bernie Sanders (23%) now right behind him. The race has narrowed considerably since the fall, when Biden led the field by a whopping 28 points. Support for the former vice president has fallen by double-digits as Sanders and businessman Tom Steyer have made gains. CONT.
Jennifer De Pinto, CBS News
