As I have stated from the very start, the Republican contest will not begin in earnest until March 1 (SC is just a warm up).
In NH, the first and third place winners practically just showed up and got the delegates, while the other candidates essentially gave it all they had at their disposal.
With the exception of Cruz, all the other candidates have ignored the South, having behaved as if there are no Republican voters there; some rely on the endorsements from their own family or from a governor of a state, others have no ground operation, yet they somehow think it is all going to work out.
In any case, any Republican who will win the nomination will be up against collectivism/socialism/with a nuance of communism (Sanders), a very good opportunity to score a big win.