Some of the demographics for that PPP poll of SC
On the Democratic side Hillary Clinton leads Bernie Sanders 55/34. South Carolina exemplifies the way in which the Democratic race changes in places where there's a large African American electorate. Clinton and Sanders are tied with white voters at 46%, pretty similar to how the race played out in Iowa. But among African Americans Clinton continues to have a substantial advantage over Sanders at 63/23. Clinton is very popular among black voters with a 71/12 favorability, while feelings about Sanders continue to be pretty mixed with him coming in at 39/33.
South Carolina's being an open primary works to Sanders' advantage. Clinton is up 31 with actual Democrats, 60/29, but Sanders cuts a lot into her advantage thanks to a 55/27 lead with the independents planning to vote in the Democratic primary. Some of the other customary big demographic splits we've seen in other places present themselves in South Carolina as well- Sanders is up 45/43 with men and 44/42 with younger voters, but that is more than drowned out by Clinton's 64/25 advantage with women and 70/20 one with seniors.
http://www.publicpolicypolling.com/main/2016/02/trump-clinton-still-have-big-sc-leads.html#more
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