Anti-Defamation League
“As one of our nation’s leading civil rights and human relations organizations, the Anti-Defamation League combats prejudice and discrimination and promotes intergroup relations. We believe that it is important to make sure the law is able to protect all members of society. A constitutional amendment banning same-sex marriage would have the opposite effect.
We oppose any effort to amend the United States Constitution in a manner that discriminates against a specific group of Americans. That is exactly what this proposed amendment does. It targets an entire class of people for social, economic, and civic discrimination in a way that is anathema to American principle of democracy.
As the United State Supreme Court in its landmark decision in Romer v. Evans, is it not within the American constitutional tradition to use the law to single out any group for discriminatory treatment. Discrimination on the basis of sexual orientation is as ugly as any other form of discrimination.”