I think it's rather funny that John Tierney has endorsed polygamy, but what says a lot about him as that when he put on his deep thinking cap to do so it never occurred to him to consider or endorse more general polyamorous arrangements. Nope, for Tierney, it's all about women joining a harem to get ahead. At least we know what's in his porn collection.
Personally I don't really care how people arrange their lives into consensual (key part) relationships. However the complexities of such formal legal arrangements may be too much for the state to deal with. The division of assets, child custody arrangments, and other issues would be very difficult to handle in the case of divorce. And the state's interest in the welfare of the children generally is made a bit more difficult to handle.
