Would a rational person ever choose marry a person they didn't prefer? One could argue the "business" relationship or marriage of convenience, but these are more the exception than the rule. It is specious to argue that the choice of who we marry and the person we prefer to marry are separate things. The right to marry involves the right to choose and, it should always be difficult for the government to interfere with that choice. Do you believe that notion is not supported by constitutional principles? Should the government be able to restrict marriage between brown-haired people - meaning that brown-haired people can't marry one another?