(Baptist Press) Redefining marriage to include same-sex couples would jettison the rationale and logic behind prohibitions on polygamous marriages, according to several friend-of-the court briefs urging the U.S. Supreme Court to uphold the traditional definition of marriage.

“Ultimately, there is no principled basis for recognizing a legality of same-sex marriage without simultaneously providing a basis for the legality of consensual polygamy or certain adult incestuous relationships,” reads one of the briefs, filed by the Christian legal group Liberty Counsel. “In fact, every argument for same-sex marriage is an argument for them as well.”

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