AUGUSTA — A federal magistrate judge is recommending that information about donors to a group that helped to finance a successful referendum campaign to repeal Maine’s gay marriage law last fall be turned over to a state election regulatory board.

U.S. Magistrate Judge John Rich III said in a document dated Sunday that the National Organization for Marriage, which contributed $1.9 million to the campaign to repeal Maine’s gay marriage law, should turn over fundraising documents dating back to Jan. 1, 2009, to the Maine Commission on Governmental Ethics and Election Practices.

The ethics commission voted last October to examine the group’s contributions after it was accused of not reporting the names of many donors.