The more I think about it, the more I think John Kerry was a great choice for Obama's second-term secretary of state. Granted, he wasn't the president's first choice. But Obama may have stumbled into a pretty good decision. The main reason is that Obama's second term is going to involve a number of lines of sensitive, patient diplomacy that could be politically unpopular at home, or at least easy to attack. Let's take them one by one.