Interesting question. As you know, ‘marriage’ is not mentioned in the constitution. We also know that the Fonding Fathers intentiionally steered clear of social issues.
However, you may be right that they understood marriage to be ‘foundational’. I don’t think anyone would argue against marriage being a great benefit to society as a whole, for reasons that include child custody, paternity identification, family stability, and survivor rights.
I would be interested to know what discussions took place among our Founders, but my guess is that it was a conscious decision to leave it out.
AND our founders in their wisdom stated that there are unalienable ‘rights’ established by the Creator, no man/government could give or take.... ‘life’, ‘liberty’, and ‘the pursuit of happiness’.
There is NO ‘life’ ‘liberty’ or ‘happiness’ in perversion. These are matters NOBODY can do it better. Some things do not require long wordy minds of men/women to be stated. Marriage is one of those sacraments designed from the beginning by the Creator. Mess with Him and the whole civil society self-destructs.