Personally, I think it is no one's business who people want to marry. Gay, straight, whatever-they're the ones that have to spend the rest of their lives with these people.
What does it matter if 2 men or 2 women want to get married? I just don't see what the big deal is.
Why should I care about who John Doe over in San Francisco wants to marry???
It doesn't concern anyone, so people should mind their own business.
I think it should be fine for people to marry whoever they want!