Irish voters have overwhelmingly backed amending the Constitution of Ireland to allow gay and lesbian couples to marry.

Supporters trounced opponents 62.1 to 37.9 percent.

Official results from Friday's vote were announced live Saturday on big-screen televisions to a crowd of thousands gathered at Dublin Castle's central square.

Leo Varadkar, a Cabinet minister who came out gay during the campaign, called the vote “a social revolution.”

“People from the LGBT community in Ireland are a minority,” he said. “But with our parents, our families, our friends and co-workers and colleagues, we're a majority.”

The Iona Institute, a socially conservative Catholic advocacy group, backed the “no” campaign.

“We would like to congratulate the Yes side on winning such a handsome victory in the marriage referendum,” the group said in a statement. “For our part, The Iona Institute is proud to have helped represent the many hundreds of thousands of Irish people who would otherwise have had no voice in this referendum because all of the political parties backed a Yes vote.”

Attention now turns to Northern Ireland, the last country in western Europe where gay couples cannot legally marry.