I have said that should Cruz place second in NH, he would be able to go to SC and beyond arguing that he can win the states that he would do well in, while competing in all the rest. Likewise Trump would be able to technically do the same thing, however he would be coming in having won NH trying to convince the people of SC who are nowhere near as progressive as NH that he could win. Cruz would have an easier sell I think.
I would have thought that too but Trump has been #1 in SC for a while. In fact all the "logical" arguments why Trump "can't win in the south" are - forgive me! - trumped by the many polls in the south which show Trump ahead.