ALBANY — Lawmakers voted late Friday to legalize same-sex marriage, making New York the largest state where gay and lesbian couples will be able to wed and giving the national gay-rights movement new momentum from the state where it was born.
“I apologize for those who feel offended,” Mr. Grisanti said, adding, “I cannot deny a person, a human being, a taxpayer, a worker, the people of my district and across this state, the State of New York, and those people who make this the great state that it is the same rights that I have with my wife.”
Senate approval was the final hurdle for the same-sex marriage legislation, which was approved last week by the Assembly. Gov. Andrew M. Cuomo signed the measure at 11:55 p.m., and the law will go into effect in 30 days, meaning that same-sex couples could begin marrying in New York by late July.
Passage of same-sex marriage here followed a daunting run of defeats in other states where voters barred same-sex marriage by legislative action, constitutional amendment or referendum. Just five states currently permit same-sex marriage: Connecticut, Iowa, Massachusetts, New Hampshire and Vermont, as well as the District of Columbia.
At around 10:30 p.m., moments after the vote was announced, Mr. Cuomo strode onto the Senate floor to wave at cheering supporters who had crowded into the galleries to watch. Trailed by two of his daughters, the governor greeted lawmakers, and paused to single out those Republicans who had defied the majority of their party to support the marriage bill.
“How do you feel?” he asked Senator James S. Alesi, a suburban Rochester Republican who voted against the measure in 2009 and was the first to break party ranks this year. “Feels good, doesn’t it?”
The approval of same-sex marriage represented a reversal of fortune for gay-rights advocates, who just two years ago suffered a humiliating defeat when a same-sex marriage bill was easily rejected by the Senate, which was then controlled by Democrats. This year, with the Senate controlled by Republicans, the odds against passage of same-sex marriage appeared long.
But the unexpected victory had a clear champion: Mr. Cuomo, a Democrat who pledged last year to support same-sex marriage but whose early months in office were dominated by intense battles with lawmakers and some labor unions over spending cuts.
Mr. Cuomo made same-sex marriage one of his top priorities for the year and deployed his top aide to coordinate the efforts of a half-dozen local gay-rights organizations whose feuding and disorganization had in part been blamed for the defeat two years ago.
The new coalition of same-sex marriage supporters brought in one of Mr. Cuomo’s trusted campaign operatives to supervise a $3 million television and radio campaign aimed at persuading several Republican and Democratic senators to drop their opposition.
For Senate Republicans, even bringing the measure to the floor was a freighted decision. Most of the Republicans firmly oppose same-sex marriage on moral grounds, and many of them also had political concerns, fearing that allowing same-sex marriage to pass on their watch would embitter conservative voters and cost the Republicans their one-seat majority in the Senate.
Leaders of the state’s Conservative Party, whose support many Republican lawmakers depend on to win election, warned that they would oppose in legislative elections next year any Republican senator who voted for same-sex marriage.
But after days of contentious discussion capped by a marathon nine-hour closed-door debate on Friday, Republicans came to a fateful decision: The full Senate would be allowed to vote on the bill, the majority leader, Dean G. Skelos, said Friday afternoon, and each member would be left to vote according to his or her conscience
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