Yes, but where does the Constitution say anything about 1. People getting marriage benefits 2. The definition of marriage, which has been around since the dawn of man, can be changed by 5 judges in a robe and then subsequently forced on a population of 335million people, the bulk of whom have a religious objection to it - a right that IS found in the Constitution.
What are you talking about? Any Benefit by it's very existence will always be extended to one group and not another, how can it possibly be otherwise? I hear this absurd logic from libertarians/anarchists over and over. First off, this benefit is being denied to many people - single people, polygamists, incest, etc, and many of those, heck even pedophilia have more historical precedence than GM.
There is nothing immoral about saying some relationships are normal and how we evolved to be, and some are not. I am not in favor of marriage benefits, but the fact is the only reason any society has ever had them is for one reason, to join a man and woman, to suddenly say it's "hip to be gay" so now we all have make up a new definition for marriage (but don't let those polygamists or mothers/sons in cuz it's OK to use MY moral standards regarding sexuality) which violates millions of Americans religious beliefs, aside from being ridiculous in and of itself, is unconstitutional.