In our nation, we've always had equality in marriage laws. Any "gay" man has always had the right to marry a woman. Any lesbian woman has always had the right to marry a man.
What's the big deal?
No offense, but I think that is a pretty weak argument. By the same logic, one could argue that “gay marriage” doesn’t extend special rights to homosexuals because every heterosexual has just as much right to gay marry as a homosexual.