New York Senator Mark Grisanti, one of four Republicans who voted for a gay marriage bill on Friday, says his previous opposition to gay marriage was guided by politics.

In explaining his reversal to reporters on Monday, the first-term senator admitted that his previous objections were more likely political calculus.

In 2008, while running for the New York Senate as a Democrat, Grisanti wrote in a letter to local ministers that he was “inalterably opposed to gay marriage,” and labeled the institution part of a “radical agenda.”

Before he cast his vote that helped New York become the sixth – and most populous – state to legalize gay marriage, Grisanti, an attorney, told fellow lawmakers that he couldn't find a legal reason to oppose marriage equality.

Explaining his previous opposition, he said: “I had not done the research. Basically, I opposed it as my Catholic upbringing was opposed to it. But, I'm not elected as a Catholic Senator. I'm representing a lot of various groups not only in my district, but across the State of New York.”

Confronted with the letter, Grisanti told reporters: “I would say three years ago, it was probably, with that letter and how it was, was probably more political than actually conscience. And, as I said, in the last campaign, I didn't send anything out with regards to same-sex marriage, not one piece of literature.”

Grisanti also minimized the notion that he misled voters.

“If people said that they voted for me on this issue alone, that I was a 'no,' then absolutely. Then I misled them. Do I think there are a lot of people that voted on just that one issue? I don't know. I don't know what the numbers are. I do know that people also voted for me becase there was nothing being done here in Western New York.”

And he denied that he was considering switching political allegiances again.