The new Reuters/C-Span/Zogby tracking poll is out (Jan 14-16), showing little overnight movement, but a slight up tick for Thompson:

McCain 29 (nc vs. previous day)
Huckabee 22 (-1)
Thompson 14 (+2)
Romney 12 (-1)
Paul 5 (-1)
Giuliani 5 (nc)

Overall, McCain leads by 7.5% in the RCP Average for South Carolina.

Of note from the Reuters write up of the results:

A portion of the polling was conducted after former Massachusetts Gov. Mitt Romney's breakthrough win in Michigan on Tuesday, but he still slipped one point to 12 percent...

"Essentially there was no real movement overnight in what looks like a very stable race," said pollster John Zogby.

"I was looking for a sign of a Romney bounce after Michigan and didn't get it," he said. "He may have to wait another 24 hours before there are signs, but it seems reasonable he would get one."