WASHINGTON — The Supreme Court's decision Monday to let states have enforcement authority over national banks could open the floodgates for lawsuits from state attorneys general and bolster momentum for President Obama's regulatory restructuring plan.

The surprise 5-to-4 ruling was a devastating blow to the Office of the Comptroller of the Currency, which had previously won every high court challenge of its preemption power, and its full impact may not be totally clear for some time.

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