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The  super PAC supporting Rick Santorum's presidential bid is out with a new ad today, on the heels of its recently announced $600,000 ad buy in South Carolina before the state's Jan. 21 primary.

The 30-second ad from the Red, White and Blue Fund,  titled "Values," gives a nod to Santorum's roots as the grandson of an Italian immigrant.

"They fled tyranny, came to America to live their dreams.  Instilling their grandson with the values of hard work, integrity and [conviction of] character" the ad says. "Those values drive Rick Santorum as he fights the Obama agenda to stop runaway spending and get our great nation back to work."

The tone of the ad, which is the super PAC's second one running in South Carolina, is positive. It offers an endorsement of Santorum, rather than an outright attack on any of his opponents, a marked difference from many of the other super PAC ads in the field.