Sullivan, like Marshall Kirk, Hunter Madsen, and Bruce Bawer, has been described by Urvashi Vaid as a proponent of "legitimation", seeing the objective of the gay rights movement as being "mainstreaming gay and lesbian people" rather than "radical social change". Sullivan wrote the first major article in the United States advocating for gay people to be given the right to marry, published in The New Republic in 1989. Many gay rights organisations attacked him for the stance at the time. Many on "the gay left" believed that he was promoting "assimilation" into "straight culture", when the aim of most at that time was to alter codes of sexuality and society as a whole, rather than fitting gays into it. However, his arguments eventually became widely accepted and formed the basis of the modern movement to allow same-sex marriage. In the wake of the United States Supreme Court rulings on same-sex marriage in 2013 (Hollingsworth v. Perry and United States v. Windsor), New York Times op-ed columnist Ross Douthat suggested that Sullivan might be the most influential political Writer of his generation, writing, "No intellectual that I can think of, writing on a fraught and controversial topic, has seen their once-crankish, outlandish-seeming idea become the conventional wisdom so quickly, and be instantantiated so rapidly in law and custom."