I would take a PPP poll on that race with a heaping tablespoon of salt. Besides, IIRC, PPP had Bostic up by 1 and Sanford down 2 or something like that, so not even PPP has Bostic doing much better than Sanford in the general.
Here’s a recent NRO post on the race: http://www.nationalreview.com/corner/344299/mark-sanford-taxpayers-choice-congress-deroy-murdock
A forceful argument for Sanford in that piece, indeed. Just as an aside, I do worry we may be stretched a bit too thin in those 6 SC districts. A Dem upset is possible in at least, what, 4 of those ? Drawing a 2nd Black Dem district would convert 6 tenuous districts to 5 safe.