Talking to the State Department this week about President Obama's intense public diplomacy efforts during his visit to Turkey, I was reminded that Obama has yet to appoint an undersecretary for public diplomacy. That's the official charged with burnishing America's image abroad, particularly in the Muslim world, where approval ratings for the United States hover around 15 percent. Earlier this year, rumor had it that Secretary of State Hillary Clinton wanted to tap big-time Democratic donor and former Discovery Communications President Judith McHale for the post, but nearly three months later that still hasn't been made official.