Sanders probably up by 7-10 points. More than that seems too high. But, hes probably not gonna win NV or SC anyways,he would need a 60-35 win to open up that possibility, that hes not gonna get.
Personally I don't believe a 40 margin victory would guarantee victory in Nevada & SC. Any victory above 10% is a big one for me & will break the duck & give momentum.
Nevada & SC are different issues. Clinton will win SC easily IMO but Nevada is winnable for the Sanders but not just because of a big victory in NH.