Mitt Romney has a significant lead in South Carolina, according to an American Research Group poll released today.

Romney is at 25 percent among likely GOP primary voters. In second place is Sarah Palin, with 16 percent. Michele Bachmann is in third place with 13 percent, while Herman Cain is at 10 percent.

Among the single digit tier, Rudy Giuliani and Rick Perry are both at 6 percent, Newt Gingrich is at three percent, and Rick Santorum, Ron Paul, and Buddy Roemer are tied at 2 percent.

Gary Johnson received less than one half of 1 percent support — which places him ahead of Tim Pawlenty and Jon Huntsman, neither of whom received sufficient support to register on the polling results.

UPDATE: Via Dave Weigel, Nate Silver rated the American Research Group as a firm with a higher than usual rate of error in polling results.