Brian Brown, the president of the National Organization for Marriage (NOM), has signed on to speak at New York state Senator Ruben Diaz Sr.'s May 15 rally in opposition to an effort to legalize gay marriage in the state.

NOM is the country's most vociferous opponent of gay marriage, and Diaz is its counterpart in the Senate.

“On May 15, Rev Díaz called for a rally in the Bronx and I will be there!” Brown wrote in an blog post at the group's website. “Talk about fighting for marriage in the deep blue country! But marriage is an extraordinary issue which gathers together people of all races, creeds and colors in defense of an idea: Marriage is the way we bring together the two great halves of humanity, male and female, in part so that children can know the love of their mom and dad. We're gearing up with Rev. Díaz and thousands of New Yorkers to fight for marriage. Pray for Rev. Díaz and for all on the front lines of this fight, will you? And following Rev. Díaz's lead, pray for those who wish to redefine marriage—for their safety, for a new spirit of civility and decency—and for the conversion of their hearts to support for marriage.”

While New York is deep blue country – 58% of New York voters support marriage equality – a majority of senators remain opposed to giving gay and lesbian couples the right to marry. A 2009 effort failed after Republicans in the Senate united against the bill.

To succeed, supporters will need to change the minds of six senators who previously voted against the measure.