For more than a year, Sarah Palin has been one of the most famous political and cultural figures in the country. Even by that standard, though, last week was an extraordinary one. On Thursday came word that the former Alaska governor was working on a TV series about her home state, currently being pitched by one of television's top producers. A day before that, her publishers announced she was embarking on a second book, a follow-up to her blockbuster "Going Rogue." And a day before THAT, she was the prize guest on Jay Leno's second day back as host of...