Superbelt

I'm sorry but being gay is not a small factor in ones life. Especially when being so means your party is actively trying to keep you from gaining the same rights as straight couples. All marriage rights such as getting health benefits and property sharing. That is an enormous part of your life. The Republican platforms also are against gays and lesbians adopting. And being a "single parent" especially hampers that ability.
Raising children is an extremely large aspect of ones life.

I know there are Republicans who are supportive of gay rights, including civil unions and even marriage. But the simple fact is the partys official platform, its national agenda is to deny any kind of union rights to gays and lesbians. The Republican President has even made it a focal point of the 2004 general election through his SOTU to deny rights to them at any cost, up to and including modifying the constitution. That puts the party at absolute odds with its members.

I suppose these log cabin republicans want to feel effective in the national elections. Because the Republican party is not working in their interests. The closest part to their interests is Libertarian.