Matthew Lewis in the Daily Caller asks, with the Supreme Court's ruling on DOMA, why doesn't the government have an obligation to honor polygamous 'marriages' as well?

"...The arguments [for gay marriage and polygamy] are essentially the same. For example, Sen. Al Franken recently issued a statement saying, “Our country is starting to understand that it’s not about what a family looks like: it’s about their love and commitment to one
another.” Polygamists couldn’t agree more.

I mean, who are we to say that two or three or even four consenting adults — who want to make a lifelong commitment to love each other — shouldn’t be allowed to do so?

What’s magical about the number two?

In fact, you could argue that there is an even better argument for polygamy than for same sex marriage. For one thing, there’s a long tradition (just look at the heroes of the Old Testament.) It’s also intimately tied to religious practice, which means that by prohibiting polygamy, we might also be undermining the “free exercise thereof.”

Why should we impose our values on others?..."