Read the full Rasmussen Reports poll

Mike Huckabee leads in the South Carolina Republican primary race with 28 percent, followed by Fred Thompson and Mitt Romney tied at 18 percent. Huckabee garners the biggest share of the evangelical and conservative vote, while Romney has an edge among moderates. However, the race in South Carolina remains very fluid and could easily be impacted by results from earlier voting.

On the Democratic side, Hillary Clinton dropped from a 10 point advantage a month ago to a paper thin 36 percent to 34 percent edge over Barack Obama among likely primary voters. John edwards is third at 13 percent, and the other candidates barely register. Obama has been helped by a significant improvement in support from African-Americans.