It isn’t about them getting the right to marry. It is about them getting to redefine marriage for the 98% of us who are straight and prosecute us if we don’t go along with it.
Eventually, "marriage" will be defined as "the person who you are having anal sex with most," or "the person you would be having anal sex with, if you weren't completely grossed out by the concept."
And it’s about having the power to trump the will of the people.