Oh, Palin's been called just about every bad name you can call a woman at some point or another. Never by anyone as prominent or influential as Rush Limbaugh though.
Incidentally, do social conservatives seriously have no concept of how birth control works? I mean seriously, the first time I was ever educated about the pill was when I saw a girl taking hers on the bus in my sophomore year of high school. I asked her politely about it and her explanation included the phrase "have to take it every day, around the same time". Heck, there are even commercials for competing forms of Birth Control that mention it!