Descending from the heavens for the G8 summit at beautiful Lough Erne this week, President Obama caused some amusement to his British hosts. The chancellor of the exchequer had been invited to give a presentation to the assembled heads of government on the matter of tax avoidance (one of the big items on the agenda, for those of you who think what the IRS could really use right now is even more enforcement powers). The president evidently enjoyed it. Thrice, he piped up to say how much he agreed with Jeffrey, eventually concluding the presentation with the words, “Thank you,...