The world’s largest organization of psychologists took its strongest stand to date supporting full marriage equity, a move that observers say will have a far-reaching impact on the national debate.

The policymaking body of the American Psychological Association (APA) unanimously approved the resolution 157-0 on the eve of the group’s annual convention, which opens here today.

The group, with more than 154,000 members, has long supported full equal rights for gays, based on social science research on sexual orientation. Now the nation’s psychologists — citing an increasing body of research about same-sex marriage, as well as increased discussion at the state and federal levels — took the support to a new level.

“Now as the country has really begun to have experience with gay marriage, our position is much clearer and more straightforward — that marriage equity is the policy that the country should be moving toward,” says Clinton Anderson, director of APA’s Office on Lesbian, Gay, Bisexual and Transgender Concerns.

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