Polls predict a Clinton victory in South Carolina, but seriously underestimate her strength

Source:  Real Clear Politics (Feb. 10-25 avg.), The New York Times (results)

Clinton wins SC in landslide.  (The State, 2/27/2016)

All you need to know.  Clinton won black voters by a margin of 84-16, according to network exit polls. African-American voters made up 62 percent of primary voters, up from 55 percent in 2008, according to exit polls. South Carolina was the first state of the 2016 primary season with a significant African-American population.  

The worst prognosticators:

• Bloomberg:  Clinton 53, Sanders 31
• Public Policy Polling:  Clinton 55, Sanders 34