David Blankenhorn, a prominent gay marriage opponent, has reversed course, saying “the time has come for me to accept gay marriage.”

Blankenhorn wrote of his change of heart in an op-ed titled How My View on Gay Marriage Changed published Friday in The New York Times.

In 2010, Blankenhorn, the founder and president of the conservative group Institute for American Values, served as an expert witness in favor of California's gay marriage ban at the trial challenging the constitutionality of Proposition 8.

“I opposed gay marriage believing that children have the right, insofar as society makes it possible, to know and to be cared for by the two parents who brought them into this world,” he wrote in his opinion piece. “Whatever one's definition of marriage, legally recognizing gay and lesbian couples and their children is a victory for basic fairness.”

Blankenhorn argued against gay nuptials in his 2007 book The Future of Marriage.

In his Prop 8 testimony, Blankenhorn signaled a shift in his opposition, saying that legalizing gay marriage would “improve the well-being of gay and lesbian households and their children” and that marriage equality in the United States would make the country “more American.”