Brian Brown, president of the National Organization for Marriage (NOM), strongly believes Minnesota voters will approve a constitutional amendment that defines marriage as a heterosexual union, thereby banning gay and lesbian couples from the institution. Lawmakers approved the amendment on Saturday and sent it to voters for their approval in 2012.

The Washington-based group has been at the forefront of the marriage debate since backing California's 2008 voter-approved gay marriage ban, Proposition 8, which overturned a state Supreme Court ruling that legalized the institution in the state.

In remarks to NPR, Brown suggested a recent Star Tribune Minnesota Poll which found a majority (55%) of Minnesotans opposed to the amendment was biased.

“People doing polls want to get the results they're getting,” Brown said.

“In Minnesota, they'll do what 31 other states have done – vote for traditional marriage. We've been working with the state groups, just as we did in Maine and California, and we will financially support them.”

“The only poll that counts is what happens in the ballot box, and we've never lost,” he added.

A Gallup poll released last week found 53% of respondents support the legalization of gay marriage, while 45% percent disagree, and two percent don't know. It is the polling group's first survey in 15 years to find opponents of the institution in the minority.