I have an article titled "Viewpoint Diversity" Requirements as a New Fairness Doctrine forthcoming in several months in the George Mason Law Review, and I wanted to serialize a draft of it here. There is still time to edit it, so I'd love to hear people's feedback. The material below omits the footnotes (except a few that I've moved into text, marked with {}s, as I normally do when I move text within quotes); if you want to see the footnotes—or read the whole draft at once—you can read this PDF. You can see the opening sections drawing the Fairness Doctrine / viewpoint diversity requirements analogy here; here is a brief section that dismisses one argument against viewpoint diversity requirements:
[IV.] Regulators' Motivations
[It does not matter for purposes of my analysis] that modern viewpoint diversity mandates come out of a desire to promote certain viewpoints (today, conservative ones) that their backers think are unfairly discriminated against.
