Nate Silver looks at how his forecast model views three plausible scenarios in South Carolina: “a big Biden win (by 10 percentage points or more), a modest Biden win (by less than 10 points) and a Sanders win (no margin specified). As of Wednesday afternoon, the chance of these outcomes happening according to the model was 41 percent (big Biden win), 33 percent (small Biden win) and 23 percent (Sanders win), respectively.”
The bottom line: A big Biden win would reorder the race, but the other scenarios look pretty good for Sanders.