I think that the constitutional argument (that marriage isn't mentioned in the document) is misleading. The government is more than that single document. It is hundreds of thousands of other laws and the Internal Revenue service, the Social Security Administration and other entities that define marriage so that gay couples are unable to access the benefits that their tax dollars pay for. Those include paying taxes jointly, the inheritance of joint property, to survivorship, veterans and pension benefits, to joint parenting, hospital visitation, to spousal exemptions, to bereavement and sick leave, to domestic violence protection orders, judicial protections and immunity, and to any of the other 1049 federal and 400 state legal rights conferred on married couples.

GAO listing of 1049 federal laws in which marital status is a factor.

I don't want your religious marriage. I want the rights, privileges and benefits that my taxes support. There is no legal or ethical reason why I should be a second class citizen. That's what the fight is about. Liberty and justice for all.