The executive director of a group representing county clerks said a district judge in Bernalillo County on Thursday allowed the New Mexico Association of Counties and county clerks to intervene in the lawsuit.
The clerks and the association expect to file an appeal next week with the state Supreme Court.
The judge earlier this week ruled that it was unconstitutional to deny gay and lesbian couples a marriage license.
The clerks' move came as a same-sex couple in Los Alamos County brought a lawsuit to require local officials to issue them a marriage license.
Rodriguez said the Luna County Clerk’s office is not issuing same-sex marriage licenses at this time and they are awaiting a ruling from the courts.