What they actually said was

Also most of these surveys admit bias towards the right because it’s generally them that are stupid enough to do phone surveys.

So, breaking that down, surveys are mostly done by people on the right. And its “generally them that are stupid enough” (so people on the right are stupid) “to do phone surveys”

So whilst op does seem to think you have to be stupid to do phone surveys, what they are trying to say is that people on the right are the only ones stupid enough to do them. Because people on the right are stupid.