New York State Assemblyman Daniel O'Donnell will marry boyfriend John Banta on Sunday after a 31-year engagement, NY1 reported.

O'Donnell, the brother of openly gay talk show host Rosie O'Donnell, and Banta met at Catholic University in 1978 and began dating two years later. Banta is the director of special events for the Metropolitan Opera.

The 51-year-old O'Donnell introduced five bills to legalize gay marriage in the past four years.

“I'm a little anxious … It's a lot of people,” O'Donnell told the Village Voice, referring to his wedding's 400 person guest list. “After 31 years, I'm not worried if he is the right one.”

“Many people grow up and have fantasies about what this day is going to be like. I didn't really have that.”

On the subject of New York becoming the sixth state to legalize gay marriage in June, O'Donnell said: “When you are deprived of something … You don't understand what it means to be given that chance … It was clear to me that John and I would take this option.”