According to this article https://en.wikipedia.org/wiki/Banns_of_marriage The marriage license replaced this Banns of Marriage in the United States. This Banns, means "Proclamation", and was intended to prevent unlawful marriage, which included polygamy and marriage to close kin. Naturally, it could have been used to prevent interracial marriage as well, although the article never mentions this.
Ya that article is historically inaccurate. The banns was practiced in the colonies, esp. in the New England congregationalist settlements. Marriage licenses came later for the purposes of preventing miscegenation.
he believes that marriage is under the realm of " family government"
That puts him like 90% of the way there. But I'm not holding my breath he'd approve of poly.