I am not a defamation attorney, but I am a litigator and know enough to know this is not a good idea. It is notoriously difficult for a public figure to sue for defamation, and even harder when the alleged defamatory statements are in an editorial.
Add to that the fact that Ms. Palin will have to prove that her reputation was harmed. That is not going to be easy.
Sarah Palin Sues New York Times, Claiming Editorial Defamed Her - The New York Times: