According to the survey, it's 36% liberal, 30% libertarian, 27% socialist, 25% conservative....At worst that would be four different clusters; and any specific of them would be a minority.
Math. Conservatives are 3%.
Just 3 labels make up roughly 93%, and I'd say only two real clusters, as libertarian vs. socialist/liberal. I haven't noticed substantive debates here between liberals and socialists. It would be interesting to see, if someone can point some out.
Note the predominance of the Anglosphere - with the 4 top represented countries making up around 75% of the survey respondents, and those 4 countries being 4 of the top six in per capita terms.
A long blog post explains why the author, a feminist, is not comfortable with the rationalist community despite thinking it is "super cool and interesting". It's directed specifically at Yvain, but it's probably general enough to be of some interest here.
http://apophemi.wordpress.com/2014/01/04/why-im-not-on-the-rationalist-masterlist/
I'm not sure if I can summarize this fairly but the main thrust seems to be that we are overly willing to entertain offensive/taboo/hurtful ideas and this drives off many types of people. Here's a quote:
The author perceives a link between LW type open discourse and danger to minority groups. I'm not sure whether that's true or not. Take race. Many LWers are willing to entertain ideas about the existence and possible importance of average group differences in psychological traits. So, maybe LWers are racists. But they're racists who continually obsess over optimizing their philanthropic contributions to African charities. So, maybe not racists in a dangerous way?
An overly rosy view, perhaps, and I don't want to deny the reality of the blogger's experience. Clearly, the person is intelligent and attracted to some aspects of LW discourse while turned off by other aspects.