Kornacki explains:
[F]inancially and organizationally, Romney’s campaign does seem far more suited for a drawn-out battle than Gingrich. But Gingrich’s South Carolina rise is further proof of how unusually volatile this GOP race is — and how sensitive to shifts in the dominant press narrative public opinion can be.
On the strength of two relatively unimpressive victories (one of which wasn’t even a victory, it turns out), Romney practically doubled his support nationally and opened commanding leads in South Carolina and Florida — two states that had seemed resistant to him for months. But just in the past few days, as the “Gingrich comeback” narrative has taken hold, that South Carolina lead has vanished and his national advantage has shrunk to just ten points.
Thus, the narrative that emerges from South Carolina Saturday night will go a long way toward shaping the GOP race in Florida.
The Dish 