Watch the video. Did the people who were in polygamous relationships speak of the level of commitment in the marriage? If so, was it a positive experience?

From what I saw, there was not a single positive description of the situation. On the contrary, there were feelings of betrayal. Commitment and betrayal don't go together.

If you can find a happy polygamous relationship, then bring them on. Let's do some research.

Assuming of course that the makers of the video were trying to film a representative sample of polygamous marriages and were not actively looking for unhappy examples of the same. Since we all know that the objective truth is what we will learn if it was said on TV, right? It could acctually turn out to be wise not to let one single tv-crew define truth on a matter that I would guess most of us lack any concrete experience on.

That would be a bad assumption. But it so happens that what they found matches what I have found in my own experience. If you or anyone else here can find one who is happy in a polygamous relationship, then have them sign up and enlighten us. Without that, then your objectivity is as flawed as that TV crew's.

Would you mind telling us how you conducted your research and what the resulting data was?

Sure. I've known a few men who attempted to have more than one mate. It always resulted in unhappy, and often raging mad, women.

I've seen women's reactions at even the hint that their man had wandering eyes. Not good for the man.

The video in the OP corroborated those findings.

The Bible lists "one wife" as a criterion to be an elder or deacon.

Anybody care to present pro-polygamy research?

Is that what you call valid research data? No wonder.