Actress Tina Fey portrays then-Alaska Gov. Sarah Palin on "Saturday Night Live" on Sept. 13, 2008, shortly after Mrs. Palin's selection as the Republican vice presidential nominee. (Associated Press)

Actress Tina Fey portrays then-Alaska Gov. Sarah Palin on "Saturday Night Live" on Sept. 13, 2008, shortly after Mrs. Palin's selection as the Republican vice presidential nominee. (Associated Press)