your description suggests that the effect of plurality voting and consequent 2-party duopoly on reporting (and consequently on the collective minditself) is even more powerful than described here: https://rangevoting.org/MediaLapdogs.html

I don't think Prof. Smith himself really appreciated the extent to which people like Seder become obsessed with *actively* enforcing party orthodoxy. Clearly it goes well beyond a focus on the activities of electable parties.