Yeah, her popularity is plummeting that’s why you’re writing an article about her. If she’s plummeting her way to obscurity, you wouldn’t be talking about her - hoping you say it enough, it will come true.
In the last sentence we also learn that the margin of error for the smaller Republican poll sample is +/- 6.5 points. Which means, statistically speaking, that Palin could actually be just about as popular right now as she was in May, despite all the ensuing ethics/resignation/quitting kerfluffle.