Back during the election campaign, I was on the radio and a caller demanded to know what I made of the persistent rumor that Barack Obama was born in Kenya. “I doubt it,” I said. “It’s perfectly obvious he was born in Stockholm. Okay, maybe Brussels or Strasbourg.” And the host gave an appreciative titter, and I made a mental note to start working up a little “Barack Obama, the first European Prime Minister to be elected President of the United States” shtick for maybe a year into the first term. But here we are 20 minutes in, and full-scale...