The National Organization for Marriage, a New Jersey-based group that has campaigned across the country to stop or repeal the legalization of same-sex marriage, produced the ad, which focuses on what the group says will be the consequences of same-sex marriage on children.
The New York Times reported that the ad will start running today in New York City and the Capital Region.
"We'll all have to accept gay marriage whether we like it or not," the ad says.
This advertisement will compete upstate with ads supporting marriage, sponsored by the Empire State Pride Agenda. That group and its allies, until now, have dominated the conversation and lobbying over the issue.