He's got a lot to explain.  Here he is trying to explain his strong statements against gay marriage (in light of his vote for gay marriage) to the gay press:

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.”

... “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.”