She was apparently playing to her base, and from the comments here, they love her for using the word. I don't. Many conservatives would contend that when a comedian or a rap artist uses the F word, it reveals his vulgarity and lack of talent. I don't see why Sarah should be exempted from that criticism.
This just provides more ammunition for the left to use against her. They will use it, and her unfavorable ratings will rise even higher. Not good, if we want her to be the next president.
She didn't USE the "F" word, she ALLUDED to it, by mentioning the acronym created by Obama's remarks. I think it was a brilliant move on her part, because we all know what WTF stands for, and even though many of us do not use the "F" word, it was the PERFECT comment on Obama's agenda.