Not every nuance or event in history is covered in the Bible. In my mind, since Paul addresses that pastors are intended to be the husbands of one wife as are deacons, there might have been an issue with polygamy along the way. It just isn't addressed as such.
On the other hand, whilst we recognize marriage under God, it is the state, country that establishes laws for marriage and even divorcement.
In Canada, polygamy is illegal, and in Canada, this is the basis for the legal charges in BC. That court will not answer to the Bible, but to the law.
I certainly do not believe in polygamy, but chapter and verse I do not have. It is, however, good for the pastor and deacon, it must also be good for the common member of the churches and for society at large. That is my opinion. If a polygamous man walked down the street with his wives in tow, I would still greet them with human and societal respect and consideration. We must not draw lines in the sand and avoid people for what they are. If Jesus could offer help to a woman facing stoning for being a woman of the night, can I do less?
I do remember a preacher in London who almost had his career cut short because he visited a "career" woman in Soho at the request of her mother. He dared to visit her at her place of employment. He was doing nothing wrong, but members of his church saw him and started the stories spreading. If that man had been maliciously dismissed from ministry, we would have lost G. Campbell Morgan!
Cheers,
Jim