Why yes the left does, but only when it's convenient. It is not convenient in this dispute because love justifies Gay marriage. But unfortunately, the love of a man to a man is absolutely different than that of a woman to a woman, and both are absolutely different than the love of a man to a woman. Therefore Gay marriage is impossible if love is the definition of marriage, which I agree is no definition at all.
Further by my stating the obvious, I do not accept your hatred and demand that I am denied the right of having gay friends, nor the vehemence of your hatred denying gays the right to be friends of people who disagree with their favor of Gay marriage--and what of those who disagree. I guess they are traitors of some sort.