This morning on ABC's "This Week" McCain talked about "two parent families" being preferable to gay adoption.

STEPHANOPOULOS: What is your position on gay adoption? You told the "New York Times" you were against it, even in cases where the children couldn't find another home. But then your staff backtracked a bit.

What is your position?

MCCAIN: My position is, it's not the reason why I'm running for president of the United States. And I think that two-parent families are best for America.

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There are dozens of studies, including some from the American Psychological Association, showing that a supportive environment is far more indicative of emotionally secure children than the sexual orientation of the parents.

But the "gay parenting" lesson for John McCain, unfortunately, has to begin with the incontrovertible fact that a gay or lesbian couple is a two-parent family. Sigh.