Minnesota for Marriage pushes back on misleading claims by their opponents:

"The claim of marriage amendment opponents, most recently including some doctors, that 25 years of research supports the conclusion that there are “no differences” in outcomes between children raised in gay and lesbian households and kids raised in intact homes by their mother and father is false. As chronicled in the journal Social Science Research there is no scholarly rigorous body of scientific research that supports the idea that children raised in gay or lesbian households do as well as or better than children living in an intact home with their married mother and father.  In fact, the most recent, peer-reviewed research casts serious doubt on the “no differences” claim and suggests that there may in fact be significant differences. 

"The statements made by some doctors and gay marriage advocates that dedication and love is the primary factor in child well-being relies on the underlying premise that family structure does not matter—a claim which is both unsupported by significant data and an assault on common sense,” said Jason Adkins, Minnesota for Marriage vice chairman. “Men and women are not interchangeable parts or parents. We continue to ask gay marriage advocates which parent is insignificant or less important for a child, a mother or father, and they and their allies continue to ignore the question and move into the realm of agenda-driven politics."