Guinness is walking away from New York City's St. Patrick's Day Parade. 

The Irish brewer announced today it would not participate in tomorrow's parade because gay and lesbian groups aren't allowed to march in it. 

Guinness has been a big sponsor of the parade in the past. 

The move came the same day Boston Mayor Thomas Menino skipped that city's St. Patrick's Day parade. 

Sam Adams had already pulled out of the Boston parade and Heineken dropped its sponsorship of New York City's event.