NOM's founding Chairman Prof. Robert George, along with Ryan T. Anderson and Sherif Girgis write about "Marriage and the Presidency" in National Review:

At least President Obama is not dissembling anymore about his views on marriage. And even though we consider his support of redefining marriage a deep error, he has done the nation a favor by revealing the truth about his position. So did the vice president, days earlier, when he opined about “the simple proposition” that “this is all about” — “what all marriages, at their root, are about.” That is, the administration has created a long-awaited and much-needed platform for a national discussion of the core issue in the debate: What is marriage?

... The president has now created a platform for this very discussion; and it is a discussion we look forward to having. For as Obama himself implied, this is not a dispute featuring “bigots” on one side, any more than it has “perverts” on the other. It is a debate of reasonable people of goodwill who disagree about the nature of the most basic unit of society. In saying that he supports letting states decide the definition of marriage for themselves, Obama indicated that this issue shouldn’t be settled by judicial fiat. On this, we agree. Our national conversation shouldn’t be brought to an undemocratically abrupt end. But as it continues, advocates on all sides must contend with, and answer, the central question in this debate, without which we can’t know the what or the why of legal recognition, much less what justice demands: What is marriage?