There Is No Logical Reason to Ban Polygamy

There's no logical reason to ban polygamy, once gay marriage is allowed. Here's the gay marriage lawyer who is arguing before the Supreme Court, when asked why polygamy would not be allowed, using the same arguments as the traditional marriage side.

Justice Alito: Why Not Let 4 Lawyers Marry One Another?

There'd be two. One is whether the State would even say that that is such a thing as a marriage, but then beyond that, there are definitely going to be concerns about coercion and consent and disrupting family relationships when you start talking about multiple persons.