Gay Republicans need someone to pay attention to them. Heaven knows the Straight Republicans aren't.
Or at least, it's the kind of attention gay citizens in general can do without. Otherwise we would have no press release from the Log Cabin Republicans to discuss.
Is paying attention to a potential constituency a "fixation"?
And yes, they really are a potential constituency. If the party to which you belong is in the process of declaring you a second-class citizen, the temptation is great to jump to the party that says you are first-class. From your new, more secure position, you can attempt to change your new party from the inside.