Sarah Palin, as even the undiscerning underbelly of clueless teabaggers tire of her. No, I mean to speculate wildly.
The perfect candidate for the base Republican base is a porn star who has found Jesus - right after aging out of the biz, conveniently. Can you imagine a 35-year-old silicone marvel distracting the mouth-breathers from the clever, behind-the-scenes ministrations of the gray eminences of the right, say Newt Gingrich?
Impossible, you say. Even they couldn't sink so low.
Ha. In the race to the bottom, there is no bottom. As low as their base voters will let them go, they'll go. The Republicans don't care what their pandering might destroy. Look at all the institutions they're gleeful about trying openly to kill. They believe that destruction is positive - as long as they're doing the destroying themselves.
After Scott Brown, someone attractive who shows more than he did is the natural next step in a long line of ever prettier, ever more vacuous figureheads.