LONDON – It was all going so well. But when the time came for President Obama to deliver his toast to Queen Elizabeth Tuesday night, the meticulously planned state dinner at Buckingham Palace turned, well, awkward. As Obama began wrapping up his remarks, he put down his notecards and picked up his glass. “Ladies and gentlemen, please stand with me and raise your glasses as I propose a toast,” the president said, as the guests stood up. “To her majesty the Queen.” At this point, the band queued up “God Save the Queen.” But Obama wasn’t quite finished yet. So...