Governor Sarah Palin's favorability rating may have plunged after her interview with CBS's Katie Couric and the spoof of it on Saturday Night Live , but her own appearance on SNL last weekend gave her favorability a significant boost, according to a study conducted by HCD Research and the Muhlenberg College Institute of Public Opinion. Among all those participating in the poll, Palin's favorability rating rose to 54 percent from 51 percent. Among Democrats it rose to 24 percent from 18 percent and among independents, to 55 percent from 50 percent. Republicans, who had already given her a whopping 83 percent favorability rating, lifted that figure to 85 percent following the show.