CJ Roy Moore on the possibility of defying a SCOTUS ruling:
It would be a very hard decision, because I know there’s nothing in the U.S. Constitution that authorizes the Supreme Court of the United States or any federal court anywhere to misinterpret the word marriage.
(From an AL radio program, quoted in the NYT)
Also from that NYT article (although the whole thing's worth a read):
If State Supreme Courts followed the Alabama Supreme Court’s lead, a system of dual courts simply would not work. The United States Supreme Court, which hears only 80 to 90 cases per year, would not be able to disentangle the legal morass that would result if state courts routinely thumbed their noses at the decisions of their local lower federal courts.
Chief Justice Marshall observed, “If the legislatures of the several states may at will annul the judgments of the courts of the United States, and destroy the rights acquired under those judgments, the Constitution itself becomes a solemn mockery.” This holds just as true if state courts exercise an identical nullification power over federal court orders.
The Alabama Supreme Court’s action represents an unfortunate departure from the cooperative norm that must prevail between these independent judicial systems. Other state judiciaries would do well not to follow its example.