Bill Clinton knows even presidents aren’t always right. The former president penned a Washington Post op-ed that went online Thursday night that calls for the end of the Defense of Marriage Act, which he signed into law in 1996, defining marriage as between a man and a woman. He explains that at the time DOMA was viewed as defusing an effort to create a gay marriage ban as a constitutional amendment. “As the president who signed the act into law, I have come to believe that DOMA is contrary to those principles and, in fact, incompatible with our Constitution,” he writes, saying that, “the law is itself discriminatory.”