A new SurveyUSA poll in SC (Dec. 17-18, 496 Dem LV, MoE +/-4.5%) shows Clinton and Obama neck and neck.

Clinton 41 (-3 vs. last poll, Dec. 7-9)
Obama 39 (-1)
Edwards 17 (+6)

Clinton leads the RCP Average for South Carolina by 1 point

Of those surveyed, the younger crowd tended to lean toward Obama. Among the divided age groups, Obama carried the 18-34-year-olds by 22 points, while Clinton carried those 65+ by 25 points. In the middle, Obama won the 35-49-year-olds by 5 points, as did Clinton among those 50-64-years-old.