Obama Is Right to Tell the British What He Thinks

This week, U.S. President Barack Obama will dive into a nest of vipers as venomous as anything Republicans can offer: Britain's debate over whether to leave the European Union. As far as campaigners for "Brexit" are concerned, he is a most unwelcome guest. Yet Obama is right to speak up. The U.S. has an interest in Britain remaining in the EU, and that gives him an obligation to articulate what that interest is. U.K. voters need to hear what he has to say, because proponents of leaving the EU have already involved the U.S. in their campaign.