Blocking Conservative Blogs

I was reading this interesting article at Gates of Vienna about the US Department of the Interior blocking conservative blogs from their network. But they are not blocking liberal blogs. This is crazy. I totally understand an employer blocking all major blog domains (blogspot, typepad, etc) but to only block some. That is a mistake and I am curious if it will be a lawsuit also. Who actually makes this call to begin with? It can't be anyone as high up as the Secretary but this is definately above the tech guy's pay grade. This is one of the many reasons Conservative Republicans back small government;).