Ryan Anderson of Heritage (and co-author of What is Marriage? One Man, One Woman: A Defense) writes in CNN:

"...So what about that release from the American Academy of Pediatrics? Two eminent political scientists, Leon Kass (a professor at University of Chicago) and Harvey Mansfield (a professor at Harvard), filed an amicus brief with the Supreme Court cautioning against accepting politicized science: "Claims that science provides support for constitutionalizing a right to same-sex marriage must necessarily rest on ideology. Ideology may be pervasive in the social sciences, especially when controversial policy issues are at stake, but ideology is not science."

Kass and Mansfield urge the court not to redefine marriage based on new, inconclusive research. The academic studies on same-sex parenting purporting to show "no differences" are, they argue, "subject to severe constraints arising from limited data" and a lack of "replicable experiments." The professors contend:

"Even if same-sex marriage and child rearing by same-sex couples were far more common than they now are, large amounts of data collected over decades would be required before any responsible researcher could make meaningful scientific estimates of the effects."

Although we still have much to learn about the impact of same-sex parenting, we do know quite a bit about marriage and child well-being. We have decades of rigorous social science data confirming that children do best with a married mother and father.