The Supreme Court on Monday declined to hear an appeal from a national anti-gay marriage group that tried to thwart Maine's campaign disclosure law requiring it to release its donor list.

The high court turned aside an appeal from the National Organization for Marriage, which donated $1.9 million to a political action committee that helped repeal Maine's same-sex marriage law.

Maine's campaign disclosure law requires groups that raise or spend more than $5,000 to influence elections to register and disclose donors. NOM contends that releasing the donor list would stymie free speech and subject donors to harassment, but the lower court refused to throw out the law.

Voters repealed Maine's gay marriage law in 2009, but it's on the ballot again this November.

For now, the 2009 donor list remains under wraps.

The state ethics commission is still investigating whether NOM falls under the state's ballot question committee requirements, said its executive director, Jonathan Wayne.

"Today's decision by the Supreme Court is an important development, but no decision has been reached by the commission regarding the National Organization for Marriage's 2009 activities," he said.

Matt McTighe, campaign manager for Mainers United for Marriage, which supports the gay marriage proposal on the Nov. 6 ballot, said gay marriage supporters don't care so much about who's on NOM's list of donors but rather want the organization to play by the same rules as everybody else.