"Without serious dissent, democracy is a sham"

Jeff Cohen fears for Keith Olberman. (Here are the Olberman Special Comments Cohen's referring to.) But here's my (and BD's) question: does Olberman delivering the Commentaries himself undermine his other identity as "neutral," "non-partisan," or "fair" anchor/reporter? Should news and editorial pages be better separated, as they (theoretically) are in newspapers?