The standard of marriage being comprised of TWO PEOPLE is supported by Same-sex marriage advocates.<quoted text>
Polygamists were held in check by the same standard as everyone else, one man and one woman as husband and wife. Now that that standard is no more in a few states, they have an in.
At no point in any court argument made by proponents of same-sex marriage have we asked for marriage to include more than two people. We've not asked that marriage be allowed between adults and minors, humans and animals, humans and inanimate objects, etc.
One man, one woman; one man, one man; one woman, one woman... That's what we are supporting.
It is deceitful for you to imply that same-sex marriage proponents are in favor polygamy.