On July 3rd, 2009, Sarah Palin resigned as Governor of Alaska, and nailed the following sign to her door: “Men Wanted For Hazardous Journey. Small wages. Bitter cold. Long months of complete darkness. Constant danger. Safe return doubtful. Honor and recognition in case of success.” This, the most famous newspaper advertisement ever penned, placed its original author, Sir Ernest Shackleton, in the position of having to select the crew for an Antarctic expedition from among the 5,000 men the ad brought to his office. Comparing Sara Palin to the greatest explorer in history might appear to stretch the limits of...