Jenny Sanford has a lot to say about "Mark."

Like how she was "scammed" by him. And how he is a "big waster." And she wants everyone in South Carolina to know it.

Okay, the former Palmetto State first lady isn't talking about that Mark -- ex-husband, onetime governor and now Rep. Mark Sanford (R-S.C.). She's talking about Republican Mark Hammond, the secretary of state. And she's doing it on behalf of Ginny Deerin in one of the cleverest ads we have seen this election cycle.

Deerin, as The Post's Karen Tumulty recently wrote, is Hammond's long-shot Democratic challenger. She's been lining up support from conservative organizations and surrogates in her attempt to spring an upset.

"I'm a conservative. I'm a Republican. And on Tuesday I'm voting for Ginny Deerin," concludes Jenny Sanford in the campaign video posted online Thursday.

In the ad, Sanford makes wry references to the arguments that Deerin has been making against the incumbent in her campaign: that he has never moved to the capital city of Columbia, that he shows up at the office only a few days a week on average, and that he charges the state for his commuting expenses.

Mark Sanford, as you may recall, went missing as governor in 2009 -- purportedly to hike the Appalachian Trail. But he later revealed he was visiting his then-mistress, Maria Belen Chapur. The two were engaged, but Sanford, who won a return trip to Congress last year, recently revealed they had split up.

Jenny Sanford and Deerin are neighbors on Sullivan's Island. Deerin has also been endorsed by ex-Sanford chief of staff Tom Davis, now a state senator.

Karen Tumulty contributed to this post