Clemson Palmetto Poll-SC: Biden 35, Steyer 17, Sanders 13, Buttigieg 8, Warren 8

[Obama-Biden Democrat]

Well, this would be a disaster for Sanders if true, but I feel that's unlikely.

You could also argue that Bernie badly under performed in his own backyard in the NH primary. Only getting 25% of the vote, and beating Pete by 1%. NV was a caucus, which favors ideologues and benefited Bernie. There are no more caucuses left in the major states, only primaries. Bernie might do even worse in SC.