For the curious, my ancestors are from South Carolina; records suggest that a Joseph Beaudrot served in the American Revolution under Sir Francis Marion. So tonight's results have a bit of extra resonance for me.
On one level, these results are uninformative; Obama's win was so overwhelming that he earned a 20% or greater plurality (or majority) in most counties. Clinton won Horry County (Myrtle Beach) on the Eastern coastline, while John Edwards (!) won Oconee County in the Appalachian foothills by 16%, with Clinton coming in 3% ahead of Obama.
There's a three-fifths problem associated with this sort of analysis, but it would be worth examining the results among white voters only to see where he managed to fare best, if only to see what this suggests about Obama's future performance in other states. It's really not appropriate for me to speculate on what the results among white voters might have been, so I'll wait until I have more time.