That being said, even without bringing in the issues of same-sex unions, polygamy, and the like, much of what is called "marriage" by the state is a puny and wizened thing. When you think of the constitutive characteristics of marriage (a lifelong, exclusive, fertile union) and compare it to what passes for legal marriage today (divorceable, routinely preceded by fornication and intermittently open to adultery, temporarily or permanently sterile by choice) you can see that the word "marriage" has already lost most of its meaning.
Heterosexuals redefined marriage via creating no-fault divorce, a licentious junk-sex culture, and contraception.
I repeat: it was heterosexuals who queered marriage. That the queers now want in, is no surprise at all.
See Tagline for my entire comment on the matter.