The "equality" argument falls flat because the same rules do apply to everyone. I, a heterosexual, cannot marry another man either. The rules are consistent for everyone. The way gay marriage supporters try to sneak "equal rights" into the issue is by talking about "love" or "attraction", neither of which are prerequisites for civil marriage.
The argument is about homosexual couples wanting a government benefit recognizing their union. They can make their case for that- persuade enough people and they'll get it. Ramming it thru the courts however, leads to backlashes like we've seen in California. Now it's part of the state constitution and it will be much tougher to implement even if they do get more support for it.
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