Quote Originally Posted by RoadToad View Post
Personally, I think the argument that allowing gays to marry would open the door to polygamy is ludicrous. His little "gotcha" about if you say that anybody can marry anybody else, you're saying that anybody can marry several people, just doesn't follow. After all, it's already true that any man can marry any woman, so by his logic, polygamy already IS okay, just among heterosexuals.
You've misunderstood the point.

Santorum wasn't saying gay marriage would lead to polygamy. His point was that, regarding the institution of marriage, if we say we cannot "discriminate" based on gender, how can we justify "discrimination" based on number?

It's not a gotcha at all, it simply forces gay marriage advocates to admit what they don't want to admit: at some point, society has to draw a line and say, this is government-sanctioned marriage and this isn't.