Sarah Palin's new video has all the hallmarks of a campaign ad. There is the slow-motion montage set to a soaring score; shots of the candidate pumping hands and hugging fans; a flick at the race's November finish line. But Palin, the star of the spot, is not a candidate for any office — at least, not yet. And none of the female hopefuls Palin is backing this fall are anywhere to be found. In the year since Palin left the governor's mansion, observers attempting to divine her destination have wrung every ounce of meaning from her every move. To...