Newt’s margin of gain was mostly related to two things. He was trailing in previous delegate counts, and he was a shoe-in in his old state, one that assigned delegates in a block.
He is not projected to be winning any other states at this point. Because of proportionality he will gain more delegates, but you have to win states to gain on the others.
I may be wrong, but I’ll be quite surprised to see Newt win another state. Yesterday he won one state, his old home state.
He failed to win one other one.