Backers of an amendment which would ban gay marriage in Minnesota are using a controversial study on gay parenting to make their case.

Minnesota for Marriage highlighted the study in its latest Minnesota Marriage Minute video series.

The study by Mark Regnerus looked at the outcomes of 3,000 people, 248 of which had a mother or a father who at one time had a relationship with a person of the same gender. Regnerus concluded that children raised by gay parents face greater negative outcomes.

Regnerus told The Huffington Post that his study found “that the scholarly and popular consensus that there are no notable differences between the children who grew up with a mother or father in a same-sex relationship and those whose [heterosexual] mother and father were and are still married is fiction.”

But the study has been widely criticized because only 2 of the subjects reported having parents in a gay relationship for their entire childhood.

In the 4-minute clip, host Kalley Yanta informed viewers that Regnerus study “shows that children raised by a parent who has had a same-sex relationship are significantly worse off compared with those raised by their traditionally married parents.” (The video is embedded on this page. Visit our video library for more videos.)