Tony Perkins, president of the Christian conservative Family Research Council (FRC), has applauded a federal judge's ruling upholding Puerto Rico's ban on gay marriage, while Slate columnist Mark Joseph Stern has called the opinion “comically inane.”

U.S. District Court Judge Juan M. Pérez-Giménez's ruling comes roughly six weeks after a federal judge upheld Louisiana's ban, becoming the first to rule that such bans are constitutional since the Supreme Court knocked down a critical provision of the Defense of Marriage Act (DOMA) last year.

(Related: Federal judge upholds Puerto Rico's gay marriage ban.)

In delivering his opinion, Pérez-Giménez relied on the Supreme Court's 42-year-old decision in Baker v. Nelson, which left Minnesota's marriage ban standing.

Pérez-Giménez said that Baker was “still good law” and suggested that allowing gay couples to marry threatens other restrictions on marriage.

“[A]re laws barring polygamy, or, say the marriage of fathers and daughters, now of doubtful validity?” he asked.

Perkins applauded the ruling in an emailed statement, describing it as “a model of judicial restraint in the face of an epidemic of federal judges legislating from the bench on the issue of marriage” and called on other courts to follow his example.

“In my recent Fox News Sunday debate with attorney Ted Olson, I challenged him to articulate what boundaries may be placed if 'love is the only criteria for marriage,” Perkins said.

Stern, on the other hand, described Pérez-Giménez's ruling as “a hopelessly muddled mélange of casuistry, magical thinking, and almost comic inanity.”

“The Baker decision was a summary affirmance of a lower court's ruling and consisted of a single sentence,” Stern explained. “Summary affirmances, the Supreme Court once explained, are no longer binding precedent when they have been seriously undermined by later 'doctrinal developments.'”

“Pérez-Giménez seems to be forgetting something: that little case called Windsor, in which the Supreme Court ruled that a federal gay marriage ban 'degrades[s]' and 'demeans[s]' gay couples and 'violates basic due process and equal protection principles.'”

“Given that Pérez-Giménez closes his opinion by uncorking his paranoia and hissing about the looming peril of father-daughter marriages, it is probably safe to say that his ruling does not pose a serious threat to the recent judicial trend toward marriage equality,” he added.