The Daily Dish | By Andrew Sullivan:
In last week's SC GOP primary, McCain and Huckabee (the top 2 finishers), got 147,283 and 132,440 votes respectively. That's a total of 279,723. Obama just pulled down 291,000 by himself. Here's the data.
I'd say this is the game changer. Obama can now say that he's got the best ability to put southern states in play. Obama can attempt a true 50 state strategy. He probably would not win too many southern states, but winning a few absolutely obliterates the GOP's chances in November.