When former president Bill Clinton nominated Barack Obama for a second term at the 2012 Democratic National Convention in Charlotte, North Carolina, the hall was packed to the rafters with party dignitaries. One was conspicuous by her absence: Hillary Clinton, away on diplomatic business in East Timor. “For decades,” she said by way of explanation, “secretaries of state have not attended political conventions because of the nonpartisan nature of our foreign policy.”
Politicians love being thought of as nonpartisan and above the murky fray. That must explain why so many of them want to be secretary of state, even…