A study last year by the Culture and Media Institute, a conservative group, examined network news coverage of Mrs. Palin from September 29th to October 12th as she campaigned. It was 69 stories about the governor. 37 of them were negative, 30 neutral, just two, two positive. Twenty-one of the stories portrayed Sarah Palin as unintelligent or unqualified. Eight stories used clips from ‘Saturday Night Live' to ridicule her. ABC News was hardest on Mrs. Palin, closely followed by NBC.
The text of the study is available here.