Once again, prohibition of polygamy says marriages that consist of more than two individuals are illegal, it doesn't matter who those individuals are, black, white, man, woman, gay, straight; the law applies evenly to all peoples regardless of who they are.
Just like the prohibition on same sex marriage, the prohibition against polygamous or polyamorous marriage is about the imposition of arbitrary criteria placed upon what does or does not constitute a marriage.
You are fine with one but not the other. You are being hypocritical.
Which didn't happen
Prop 8 was an amendment to the California state constitution. It did happen and the judicial activist wing of the SCOTUS found the flimsiest of excuses to invalidate it.
The legalization of same sex marriage was the agenda behind both of President Obama's supreme court nominations.
Once again you're stating the obvious to no logical effect
The logic evades you, that isn't the same thing as it being absent.
Both kinds restrictions are arbitrary limits placed on the institution of marriage by society.
prohibition of poly marriage does not meet the definition of discrimination since the law affects all people equally without regard for their individual traits.
Completely arbitrary and immaterial. The institution of marriage belongs to society and society has the right to define it.
to suggest otherwise is like saying prohibiting black people from entering your restaurant is the same as prohibiting more than 10 people from entering your restaurant... Give me a break.
Not at all. I find it more akin to a baker refusing to bake a cake for a 3 person wedding.