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Libby Copeland: The heart of Sarah Palin's appeal is --



Wait, did you see that? There! She did it again: wrinkled up her nose in a way that either looks like a sneer or is adorably reminiscent of Samantha from "Bewitched." Depending on whom you talk to.



Next time you see a clip of the Republican vice presidential nominee, try this exercise. Mute your TV and just watch that face. How often do you see someone in political life so extravagantly expressive? The eyebrows go up, the shoulder leans in, the thumb jauntily gestures backward, the tongue actually fixes in the cheek. To mock Barack Obama, she licks her finger and holds it to the imaginary wind! And that smile, that nearly…