Tina Fey opens up about spoofing Republican VP candidate Sarah Palin on "Saturday Night Live!" "If she wins, I'm done. I can't do that for four years. And by 'I'm done,' I mean I'm leaving Earth," Fey tells TV Guide.

The "30 Rock" star says she's taking her Palin impersonation week by week. "Election time is always good for [SNL] and this is a bonkers election. And that lady is a media star."

Fey continues, "[Palin] is a fascinating person, she's very likeable. She's fun to play, and the two bits with Amy [Poehler], that was super fun."

For more with Tina Fey, pick up the October 20th issue of TV Guide.