See the full Clemson University Palmetto Poll

Most South Carolina voters are still unsure about who they will support in the Jan. 19 Republican primary and Jan. 26 Democratic primary. The number of undecided voters is up, and 65 percent of Republicans and 51 percent of Democrats said they were likely to change their minds before January. On the GOP side, Mitt Romney and Fred Thompson were in a virtual dead heat at 17% and 15% respectively, with Mike Huckabee closing fast at 13 per cent. John McCain is at 11% and Rudy Giuliani, at 9 percent, has lost the most ground. Among Democrats, all the top contenders are within the margin of error, with Hillary Clinton has slide 7 points since the last poll and at 19 percent is barely ahead of Barack Obama at 17 percent. John Edwards at 12 percent runs third, in the only primary state he won in 2004. The survey polled 450 likely Republican voters and 450 likely Democratic voters, and had a margin of error of 4.62 percent.