If you support the right to gay marriage, how can you not support the right to polygamous marriage? Don't they have a right to be happy too? Don't they have a right to love according to their nature and enjoy the benefits of marriage just like gays? Currently they are persecuted and outlawed, doesn't that qualify as injustice and discrimination? And aren't you stereotyping polygamous persons as child molesters just because of a handful of high-profile cases?
I thought everyone was supposed to have equal access to the benefits of lawful marriage, and here I find you're discriminating against polygamists!