One can understand an American president’s lobbying for an American city to obtain the Olympics, but the blitz by the Obamas proved a PR nightmare. Let us count the ways: 1) Obama’s brand is trans-nationalism and an “America is not exceptional” multiculturalism. According to his worldview, it makes sense that a South American country — especially a powerful, ascendant country such as Brazil — should at last have its turn at hosting the Olympics. It did not seem consistent that a politician who had reached out to the Castros, Chávez, Morales, and Ortega, in parochial fashion, would lobby for his...