I wanted to continue the conversation about polyamory that was started in the "Gay Marriage and Society -- the Sequel" thread. I recognize that it was derailing that thread, so it deserves it's own thread.
I would like to start this out with with some information.
I am a polyamorous man in a polyamorous relationship. I am a active member in the local polyamory community. I personally know hundreds of polyamorous people.
Polygamy (one man with multiple women) is not very common in the poly community. People think polygamy is way more common then it is because that is what they see on the news and (fictional) TV shows like Big Love. The reality is that quads (four people of any gender) and polyandry (one woman with multiple men) are much more common, but even those tend to just be the way relationships formed from the larger concept of 'any number of any type' that modern polyamory espouses.
I personally think that Marriage Equality needs to include multiple partner groups, but I don't think America is ready just yet. There are a lot of things that need to happen before we can have a serious national debate on Poly Marriage, but it is coming.
First we need to win the same sex marriage fight. Because poly marriage will obviously include same sex members in the groups. We need to distinguish ourselves as a group distinct from but allied with the LGBT communities. We need to convince more of our members to come out and be public about their lifestyle in order to generate familiarity with the concept of modern polyamory, and serve as examples to repair our image in the media.
We are getting organized and are starting to work on all of these issues. The national debate on poly-marriage is coming. We know it is an uphill battle, and that there is a lot of practical issues that need to be addressed, but we have answers for most of them.
From where I sit the biggest problem is getting people to accept that polyamory is even a viable alternative to monogamy.