Edwards has also been even or slightly ahead of Clinton in Iowa for a while now and I suspect he is still trouncing everyone in South Carolina.
I might be forgetting a poll, but the only SC polls from the last few months that I can remember are these ARG polls:
http://www.americanresearchgroup.com/pres08/scdem8-702.shtml
both of which have Clinton in first place.
My mistake. I incorrectly remembered him being ahead in the December poll from ARG and assumed he would continue to lead. On the contrary, it seems the more recent poll that you cited shows him slipping here. I had not seen the one from February. However, as Gov. Bacon King said we are still nine months away from the actual vote and a lot can happen in that time.
