That poll was actually on the 16th. By the 18th-20th, every poll including Rasmussen had Gingrich in the lead.
So what changed in two days?
Yes it did because Newt had a kick a$$ debate two days before SC primary. Unfortunately in Florida Newt had bad debates (two of them). That is the big difference between SC and FL.
Yeah... no cheering in one and Romney-stacked in the other. Are people just suppose to forget the SC debate?