The National Organization for Marriage (NOM) has lost another legal round in Maine.

The group, which has led efforts to repeal gay marriage laws in California and Maine, challenged Maine's campaign reporting law.

NOM claimed that the state's law, which requires groups that raise or spend more than $5,000 to influence elections to register with the state and disclose donors who make contributions in excess of $100, was overly burdensome and unconstitutional.

U.S. District Court Judge D. Brock Hornby disagreed.

“I conclude finally that this Maine law is constitutional,” Hornby wrote in his 22-page ruling released on Friday, the Kennebec Journal reported.

In 2009, NOM spent more than $1.9 million to repeal the state's gay marriage law.

Previously, Hornby, who was appointed to the federal bench in 1990 by President George W. Bush, ruled that NOM could not conceal its donor list.

Fred Karger's Californians Against Hate had asked the Maine Commission on Government Ethics and Election Practices to investigate the group. Karger, who is now considering a bid to run for president in 2012 as a Republican, claimed that NOM was not following the law's reporting requirements. He's previously called the group a front group for The Church of Jesus Christ of Latter-day Saints (the Mormons).

“They [the Mormon Church] have created front groups that can do their bidding in banning same-sex marriage throughout the United States. The Mormon Church gave $1.2 million to ban gay marriage in Alaska and Hawaii, and got caught. Ever since they work through front groups to try and hide their direct involvement,” he said.

NOM has yet to announce whether it will appeal the ruling.