(Commentary) In a study by the University of Virginia’s National Marriage Project, researchers concluded: “The intact, biological, married family remains the gold standard for family life in the United States.” Children from cohabitating homes, they found, are far less likely to thrive socially, educationally, and psychologically than children who lived with their married biological parents. Additionally, the transitions required of a child because of cohabitation, divorce, and single parenthood “are linked to higher reports of school failure, behavioral problems, drug use, and loneliness.” Th...