I want to be the first one to do this:The number of equal and opposing complaints I've seen over the years that the moderators 'have a left wing bias' or 'have a right wing bias' is the clearest signal to me that they must be pretty even handed overall. The problem, as others have pointed out, seems to be that people have gotten used to expressing what would have been traditionally strong left or right viewpoints, but have come to think of as moderate in the context of a more extreme polarised political climate.
"I don't like the mods because they have a moderate centrist bias!"
here, I had to !