I think if he won SC, it would basically be over but I think the chances of that happening are slim at the moment.
It might change based on media coverage after he wins New Hampshire though. I legitimately don't know. His numbers went up after his horrible debate performance, and after he lost Iowa. They may very well skyrocket after he actually does something good and wins a real race.
Still, Clinton is heavily favored in South Carolina.
Alabama and Mississippi are a slim possibility if there's low minority turn out and high student turn out. If a random truck driver can win the governor nomination, I see no reason a sitting Senator couldn't win the presidential primary.
NV could be a wild card. Imagine if Bernie is able to win it. I'm sure that would help him flip some states on ST.