It’s a strategy that Mr. Obama’s critics and admirers have sometimes characterized as “leading from behind.” One could rightly argue that being president of the United States is an order of magnitude more difficult than being governor of New York, and that Mr. Obama’s performance has been fair to good under the circumstances. But his seemingly risk-averse approach roils many Democrats, even as most of them approve of his overall performance.

That Mr. Cuomo’s accomplishment pertains to same-sex marriage, an issue on which Mr. Obama has adopted an indecipherable position born of a cynical-seeming political calculus, makes the contrast sharper. And that it involved achieving cooperation from Republicans, something Mr. Obama has rarely received, makes it seem as though Mr. Cuomo has more effectively executed upon Mr. Obama’s “theory of change” than the president himself, demonstrating that articulating clear and unapologetic goals is not incompatible with persuading votes on the margins.