http://america.aljazeera.com/articles/2013/12/30/navajo-aim-to-undothedinedoma.html
Massoud Hayoun; Al-Jazeera America

It's unclear whether opposition to gay marriage in Indian Country comes primarily from Native American tradition or from the influence of the majority of U.S. states where it is still illegal. A Navajo group's battle to overturn a tribal ban on same-sex unions has become a microcosm of this question.

Although Tome's interpretation of Navajo social mores indicates that Nelson's group may face some opposition because of tribal tradition, activists note that the original legislation banning gay marriage on Navajo land took root because of D.C. politics.