Given the freak fest that Oprah’s show has recently been – Mackenzie slept with her father, Whitney in denial about almost everything, etc. — she probably needed the downhome PR cleansing that today’s taping at the State Fair conferred on her. The cowboy hat, shitkickers, and silly drawl she modeled for us local yokels were a bit much, though. She better refrigerate any ol’ fashioned Texas mojo that’s left over, because she may need it: If Letterman’s threats to appear on Oprah and cry his cheatin’ heart out come true, things are about to get even sleazier in O-ville. My question – does he realize he won’t get the pick of her female staff as well?