The National Organization for Marriage (NOM) on Thursday pledged to work against a proposed referendum that would legalize gay marriage in Maine.

Shortly after supporters in Maine announced they would return to the ballot box this November, NOM, the nation's most vociferous opponent of the institution, pledged to work against the effort.

“NOM intends to vigorously fight this attempt by same-sex marriage advocates to impose gay marriage in Maine,” NOM President Brian Brown said in a statement. “Maine voters rejected gay marriage barely more than two years ago. What part of 'no' don't gay marriage advocates understand?”

Lawmakers in 2009 approved a marriage equality law, but opponents narrowly (53%) repealed it with a “people's veto” at the ballot box, known as Question 1. NOM spend $2 million on passage of Question 1, according to the group.

Advocates in Maine had already collected nearly twice the number of signatures needed to put the question on the ballot, but held back announcing their plans until Thursday.

In announcing their decision to move forward, backers also released a new poll showing that a majority (54%) of Mainers say gay marriage should be legal. Forty-two percent of respondents oppose the institution and 4 percent said they were unsure.

“The people of Maine are not in favor of redefining marriage, as we showed in 2009,” Brown added. Gay advocates are fooling themselves when they say things have changed. Voters still understand that marriage is about more than the desires of adults. They still understand that children need both a mother and father. They understand that same-sex marriage has real consequences for people of faith, small businesses, churches and religious organizations. And they understand that marriage is too important a social institution to be kicked to the curb to satisfy the political demands of a small but powerful and vocal special interest group. We are completely confident that Mainers will oppose this attempt, just as they rejected gay marriage in 2009.”