A new poll released Wednesday found foes of a gay marriage law in Washington state gaining ground.

Referendum 74 asks voters to either uphold or reject a marriage law approved by lawmakers. Previous polls showed the measure winning with a comfortable margin.

But the new statewide Elway Poll brought bad news for supporters, finding Referendum 74's lead had dwindled down to just 4 percentage points – 49-45 percent.

“We have gained 10 points since last month's poll and are within 4 points and closing in: The other side is under 50 percent for the first time,” Rev. Joe Fuiten, senior pastor at Cedar Park Assembly of God Church, wrote on his Facebook page.

Maggie Gallagher of the National Organization for Marriage (NOM), the nation's most vociferous opponent of marriage equality, said she wasn't surprised by the results.

“I've seen this kind of swing against gay marriage before, and I would say I'm not surprised: Except that this time the push for gay marriage is so monumentally huge, the money odds so monstrously lopsided, and the fight so deep in such a secular blue state, I had my doubts. Silly me,” she wrote in a National Review op-ed.

“Look for a lot of shocked pundits on election night in November. Again,” she added before asking for donations to the campaigns.

In 2009, Washington voters upheld a domestic partnership law dubbed by the media “everything but marriage.”

Anne Levinson, a former judge and a key Referendum 74 supporter, told the Seattle Post-Intelligencer that Elway had underestimated the 2009 vote.

“At the time he released a poll showing us losing: We won with 53.15 percent making Washington state the first and only state in the nation voting in favor of LGBT families,” she said in an e-mail.