Those with even limited knowledge of Iran’s history of diplomatic duplicity, not to mention its present financing and direction of a variety of insurgentand terroristic campaigns across the Middle East, are justifiably wary of the terms of the nuclear accord revealed this week. Critics of the deal contend that the lax inspections regime, dramatic sanctions relief, and the lifting of arms and ballistic missile embargos, among other gifts to Tehran, will only reward Iran’s destabilizing behavior and guarantee more of the same. It seems that the accord’s self-evident deficiencies have reduced its supporters to a defensive crouch. One of the most cutting examples of the defensiveness of the deal’s backers, however, should not be dismissed offhand. In at least one case, the left is inadvertently making the conservative case against this deal.