The House Majority PAC is of the "super" variety, a pro-Democratic group with a 3-2 win-loss record in 2012. And after five long months of campaigning, the HMPAC is the first to run an ad making explicit reference to the reason South Carolina voters don't like Mark Sanford.
Notice the Argentina shot? Of course you did:
The PAC calls it a "mid-six figure" buy. But it'll get plenty of free media—like this!