Brian Brown, president of the National Organization for Marriage (NOM), reacted to passage of a gay marriage referendum in Ireland, claiming that unprincipled political parties and the “intense harassment” of opponents were to blame for the loss.

(Related: Irish voters resoundingly approve gay marriage.)

“We are disappointed but not surprised with the apparent passage of a referendum in Ireland providing for the redefinition of marriage in that country,” Brown said in a blog post. “This is a reflection on the increasingly secularized nature of Ireland, together with the utter abandonment of principle by every political party in the nation, all of whom endorsed the referendum. This, combined with intense harassment of any group or individual who spoke out in opposition to the referendum, made it difficult for opponents. Despite this, millions of Irish citizens stood to vote to uphold the truth of marriage as the union of one man and one woman.”

With passage of the referendum, gay and lesbian couples can marry in all nations in western Europe with the exception of Northern Ireland.

“Even with this decision in Ireland, the idea of same-sex marriage has been widely rejected by the community of nations around the world, where only 18 nations recognize same-sex 'marriage', almost all of them in the west, which represents less than 10% of the nations in the world,” Brown said.

Brown also called on the Supreme Court – which is expected to rule next month on a case challenging restrictive marriage bans in four states next month – to take note of the vote.

“If there is any relevance to the Irish vote for people here in the United States, it is that the US Supreme Court should take note that the people of Ireland at least had the opportunity to vote. This is what we demand of our justices – respect the right of people to define marriage in the law for themselves. If that occurs, we are confident that the American people will continue to support marriage in the law as it exists in reality – the union of one man and one woman in order to provide the ideal environment for any children born of their union.”