The National Organization for Marriage (NOM) on Thursday lost another round in its fight to conceal its donor list.

NOM is the nation's most vociferous opponent of gay marriage. The group has had successes repealing gay marriage laws in Maine and California. It has also taken credit for derailing earlier this year proposed gay marriage bills in Rhode Island and Maryland. And it is at the forefront of heated battles to constitutionally ban such marriages in Minnesota and North Carolina. NOM has also vowed to repeal gay marriage laws in New York and New Hampshire.

In Maine and Rhode Island, NOM has been fighting disclosure laws that require advocacy groups to report details about their work, including their donors.

But in separate rulings released yesterday by the First Circuit Court of Appeals in Boston, the court upheld both states' disclosure laws.

In the Rhode Island case, the court ruled that the state's law imposed little burden on the group and served a valuable government interest, the Providence Journal reported.

In the Maine case, NOM argued that the state's reporting requirements are vague and over-broad, Maine Public Broadcasting Network reported.

Maine's laws “neither erect a barrier to political speech nor limit its quantity,” the court wrote. “Rather, they promote the dissemination of information about those who deliver and finance political speech, thereby encouraging efficient operation of the marketplace of ideas.”