Perhaps I missed this elsewhere previously, but thanks to Paul Barton for a link to a study on big independent campaign spenders. Down at Page 9 you'll see that Karl Rove's America Crossroads attack machine's backing includes $100,000 from Stephens Investment Holdings LLC. It's a Warren Stephens-backed entity.
The Mountaire Corp. is listed nearby as a $100,000 contributor to the Club for Growth. It's not clear if that's the Arkansas business or not.