Last week, a South Carolina poll found Sen. Hillary Clinton leading the Democratic presidential race with 29%, compared to Sen. Barak Obama's 21% and John Edwards at 11%.

But Political Wire points to a new poll showing Obama pulling ahead:

According to the latest Public Policy Polling survey of likely South Carolina primary voters, Sen. Barack Obama leads the Democratic presidential race with the support of 34%, trailed by Sen. Hillary Clinton with 31% and John Edwards with 15%.

On the Republican side, Fred Thompson's entry into the race is already having an impact: "Thompson leads his rivals with 27%, followed by Mitt Romney at 16%, Sen. John McCain at 15%, Rudy Giuliani at 14% and Newt Gingrich at 11%."