I just heard Michael Medved say, on his radio program, that the Bible is "at best undecided" on polygamy, if not in favor of it. He argued against a caller who said that the Bible condemns polygamy, and the caller wasn't particularly effective in responding.
As I type this, he's citing Augustine on the subject, suggesting that he didn't have as negative a view of polygamy as Christians do today. He isn't saying anything about the earlier fathers who condemned polygamy.
Medved is mistaken. I'm going to be sending him an email, which I don't know that he'll ever see, but those interested in reading more on the subject may be interested in the thread here.