You're right, brother. I think folks with a polyamorous orientation should be granted the same legal right to marry as hetro/homosexuals. Thinking otherwise is just plain bigotry! Here’s why:
1. Polyamorous Orientation: According to the theory of Genetic Imperative, many men are biologically hardwired or oriented to feel attraction toward multiple women, yet social values and socialization pressures require men to repress expression of these innate impulses (this is true across all socioeconomic, ethnic and cultural groups). Since a predominant number of men have inborn sexual tendencies that are incompatible with a monogamous lifestyle, by no fault of their own, marriage ought to be progressively redefined as a socially approved relationship between an undefined number of consenting spouses.
2. Separation of Church and State: Many state marriage laws codify and uphold religious principles that unjustly and unconstitutionally force polysexuals to conform to non-secular tradition.
3. Consequential Neutrality: Permitting men to marry at least two wives (polygyny) or women to marry multiple husbands (polyandry) will not in any way infringe on monogamists’ right to marry only one spouse. Therefore, polygamy should be permitted because of its neutral consequence to other valid forms of marriage.
4. Consequentialism: Studies have shown that parental household income and parental involvement correlates positively with many lifelong success indicators. Since multiple-parent households have greater income potential and more parental time than monogamist parents, children raised by stable polygamist parents stand to be more educated, healthy, well-adjusted and productive as adults than their monogamist-raised counterparts. Considering the significant long-term social benefits of polygamous relationships, governments should not discriminatorily deny their citizens’ right to this equally valid lifestyle.
There's also a substantial First Amendment claim for religious polygamists to engage in multiple marriages according to the dictates of their faith. That is the one that bothers many people of tolerance and diversity.