Equal Rights

The thing is, state recognized unions serve a very real purpose - they convey default rights for joint property ownership, probate/descendency, child custody, and a ton of other things. Personally, I don't care whether we call them civil unions, or marriage, or marinations (thanks, Oye) - but to deny those rights based on semantics (it's already been shown that word can have multiple meanings) is shortsighted and discriminatory.
The Government shouldn't be recognizing anyone's marriage, and it certainly shouldn't be allowed to give me permission to own my own property. Therefore it shouldn't matter at all anyway. Also, taxes is the Government's way of robbing people to fund their regulatory process, so being as how that shouldn't exist either, Marriage certainly shouldn't play any role in their operations.