A national study has indicated that the "favorability rating" for Sarah Palin drops when viewers watch Tina Fey impersonating her on Saturday Night Live . Among a group of 314 Democratic, Republican and independent voters, Palin's favorability rating dropped to 43 percent from 47 percent after they watched Fey's parody of the vice-presidential candidate. As expected, the rating fell more sharply among Democrats and independents than it did among Republicans, who were virtually unaffected by the SNL skit. The study was conducted by Flemington, NJ-based HCD Research and Allentown, PA-based Muhlenberg College Institute of Public Opinion.