Minister of Truth
Practically Perfect
Gay marriage will not harm "the institution of marriage". Gay's are not some corrupt leper. Whenever they touch marriage, it does not shrivel and die because two men love each other.
The institution becomes pointless, at its entire purpose is male-female union for the creation of a family. Not that government involvement hasn't already led it greatly in the direction of irrelevancy--it seems entirely clear that the longer marriage remains a civil issue, the less and less likely it will survive, and same-sex marriage is the next step in government making it unsurvivable.