"DOMA undermines both the public and private significance of state sanctioned same-sex marriages; for it tells those couples, and all the world, that their otherwise valid marriage sare unworthy of federal recognition. This places same-sex couples in an unstable position of being in a second-tier marriage. The differentiation demeans the couple, whose moral and sexual choices the Constitution protects, see Lawrence, 539 U. S. 558, and whose relationship the State has sought to dignify. And it humiliates tens of thousands of children now being raised by same-sex couples. The law in question makes it even more difficult for the children to understand the integrity and closeness of their own family and its concord with other families in their community and in their daily lives."
United States v. Windsor, 570 U.S. (2013) (Slip Opinon, Opinion of the Court, p. 22-23)