The Iran deal debate is huge and historic: a committed and eloquent president in his prime, able to mobilize scientists and diplomats and most of Washington's foreign-affairs establishment on one hand; opposing him, groups funded by a few billionaires, able to saturate selected congressional districts with television advertising and frighten many office holders. It's a subject that will draw historians for decades to come. If the government of Israel and its friends are able to block the Joint Comprehensive Plan of Action (Israeli security professionals are not enthusiastic about the deal but, unlike Netanyahu, generally favor it as the best thing possible), it will be perceived to be just as pivotal as Woodrow Wilson's failure to secure the United States's adherence to the League of Nations, effectively dooming that organization.