One irony of the Syria debate is that President Obama is now appealing for support on foreign policy from a Congress that he treats with contempt on domestic issues. Witness, in merely the latest example, his decision to suspend the enforcement of a federal drug law because it doesn't fit his political agenda.

In a sweeping memorandum last week, the Justice Department all but ordered U.S. attorneys nationwide not to enforce federal marijuana laws. The memo was a long-delayed response to voter referenda last November in Colorado...