Lambda Legal has played a role in many legal cases in the United States pertaining to gay rights, including the 6-3 United States Supreme Court's 2003 decision in Lawrence v. Texas, which invalidated sodomy laws.
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On May 30, 2012, both Lambda Legal and the American Civil Liberties Union announced lawsuits in state court, Darby v. Orr and Lazaro v. Orr, challenging the refusal of the Cook County Clerk's office headed by David Orr to issue marriage licenses to same-sex couples.