I honestly wish the marriage debate would end. So much conservative political capital is spent at the most arbitrary of issues.
Tradition is not a valid reason for anything. Besides, people have been getting married before Abrahamic religion was even a thing. Gay/Polygamist marriages hurt no one. It's perfectly OK to find it gross, disgusting, immoral, etc. That's your opinion and while I don't agree, I don't care whatsoever to change your mind.
It honestly surprises me that conservatives are attempting to enact such pointless pieces of legislation on this matter, considering that's a point of criticism often brought up when deconstructing the liberal position.
Humans and animals? Father daughter? What is the argument against these that would promote a compelling government objective? There really isn't if you think about it; who else does it harm? I'm not talking about the social policy aspects but the legal ramifications of a court striking down marriage laws.