Let me set the scene. Senator Kruger is a Democrat. When a bill came up two years ago, he voted against marriage equality. According to the article, marriage advocates saw him as a lost cause, figuring it was more likely they could turn enough Republicans than that they could get Kruger. But there was something marriage advocates didn't know about Kruger. He was getting blowback for the anti-gay vote in his own home:
The gay nephew of the woman he lives with, Dorothy Turano, was so furious at Mr. Kruger for opposing same-sex marriage two years ago that he had cut off contact with both of them, devastating Ms. Turano.
You mean Senator Kruger, who is living in sin, gets to veto whether other people get married? Yet he's realized the error of his ways because he needs to repair the relationship between his unmarried partner and her gay nephew!
OK. So I'm remembering reading that Governor Cuomo's wife has a gay brother or sister, and wife has been pushing Cuomo to get gay marriage legal already. To clear up my fuzzy memory I reread the article looking for that part and find I am mistaken:
The pressure did not let up at home. Mr. Cuomo’s girlfriend, Sandra Lee, has a gay brother, and she frequently reminded the governor how much she wanted the law to change.
It's not Governor Cuomo's wife who is pushing for equality but his girlfriend.
Let me paraphrase. Straight legislators were lobbied to support marriage equality by their unmarried partners who were concerned about their gay relatives inability to marry. Yay!