Brian Brown, the president of the National Organization for Marriage (NOM), has said his side is not giving up on its opposition to gay marriage.

Brown was quoted in a BloombergBusinessweek story as saying that opponents of gay nuptials would win all four states facing referendums on the issue.

In Maine, voters will decide whether to legalize marriage equality three years after a gay marriage law was repealed at the ballot box. If approved, Maine would become the first state to legalize such unions by referendum.

Maryland and Washington state voters are being asked to uphold – or reject – a marriage law approved by lawmakers.

And in Minnesota, lawmakers put on the ballot a constitutional amendment defining marriage as a heterosexual union for voters to approve.

In all four states, polls show opponents of gay nuptials trailing – as little as 1 percent in Minnesota and as much as 21 percent in Maine – and being outraised by supporters.

(Related: Maine gay marriage proponents outraise foes.)

Brown, whose organization first surfaced in 2007 and played a key role in passage of Proposition 8, California's gay marriage ban, remains optimistic.

“We have confidence that the people of all four states are going to protect traditional marriage,” Brown told the magazine. “The other side wants to make it seem inevitable. It's inevitable so you should just give up. Well, we're not giving up.”