President Barack Obama has now won enough support among Democrats in Congress to ensure that the nuclear agreement reached between world powers and Iran will move forward. But while indisputably a major political achievement, the victory is not any guarantee of long-term success. We can now see the outlines of the next phase of the struggle, in which profound disagreements over the deal persist in Washington, denying any semblance of consensus on one of the president’s most important foreign policy wins.
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