A brand new Whit Ayers poll of 600 South Carolina voters — 300 likely Republican presidential primary voters and 300 likely Democratic primary voters — was released Monday. Mitt Romney, Rudy Giuliani and John McCain are in a statistical dead heat among Republicans with Fred Thompson in a close fourth. And for Democrats, Hillary Clinton is dusting the field with a 19 point lead over second place Barack Obama.REPUBLICANS: Mitt Romney - 20% Rudy Giuliani - 19% John McCain - 17% Fred Thompson - 13% Mike Huckabee - 8% Ron Paul - 3% Duncan Hunter - 1% Tom Tancredo...