Maryland, where the law requires marriage to be between a man and a woman and where attempts to overturn that requirement have been bottled up in legislative committees, could yet join the national trend. But it will require Gov. Martin O'Malley to demonstrate more than the casual interest he has shown in legalizing civil unions, let alone gay marriage, in the past.

What Mr. O'Malley must do is this: Ask Attorney General Douglas F. Gansler for a legal opinion determining whether Maryland law permits the state to recognize same-sex marriages performed elsewhere. And if Mr. Gansler finds that it does, the governor should immediately sign an executive order directing state agencies to adjust their rules and regulations to do so.

New York Gov. David Paterson issued such an order last year. Whether Maryland's opposite-sex marriage law precludes doing so isn't clear.