What in the world does Sarah Palin have in mind? Politicians and analysts have been scrambling to make sense of Palin's sudden and unexpected announcement Friday that she will resign as governor of Alaska at the end of the month -- an announcement that gave only conflicting hints about her true motivation or future plans. "I don't know if there's gonna be another shoe to drop," said Stuart Rothenberg of the Rothenberg Political Report. "But this one wasn't merely a shoe. It was a boot and it landed with a thud." Todd Purdum, political correspondent for Vanity Fair magazine, said, "The one predictable thing about her is unpredictability." Appearing on ABC News' "Good Morning America," Purdham said, "I think on some level, she was sick of...