Here are the most recent ads from the GOP candidates, some the final ads before Tuesday's primary in South Carolina.
Mitt Romney turns his attention to Obama's policies: "President Obama wants to fundamentally transform America. I stand ready to lead us down a different path."
Rick Santorum goes after Romney in a take on Apple's '1984' ad: "They're telling us to simply ignore the fact that Romney supported the Wall Street bailout. Ignore that Romneycare includes taxpayer funding of abortions. We should simply forget that Mitt Romney once bragged he's even more liberal on social issues then Ted Kennedy."
Newt Gingrich paints Romney as "Desperate" and using the same attacks he did in the 2008 campaign.
Ron Paul goes after the other three candidates in an ad called "three of a kind": "The commercial pulls few punches, labeling Newt Gingrich a "serial hypocrite," Rick Santorum a 'counterfeit conservative' and Mitt Romney a 'flip-flopper.' The ad argues that support for the individual mandate, bank bailouts and growing the national debt — each articulated in some way by Paul's rivals — make them too liberal for the GOP nomination."