The group fought to shield its donor list before submitting the report after the Maine supreme court last week rejected a move to further delay its release.
The report filed with the Maine Commission on Governmental Ethics and Election Practices provides details of more than $2 million that NOM contributed to the referendum to overturn a gay marriage law signed by then-Gov. John Baldacci. The law was overturned by the referendum in 2009 and never went into effect.
Maine voters returned to the ballot box to legalize same-sex marriage in 2012.
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