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a huge slice of the populace -- especially those who remember Cronkite, Huntley, Brinkley et al. -- take network news at face value and are happy to be relieved by the networks' legendary claim to legitimacy of having to question, analyze, compare or in general use their brains.
Trying to find stats.
http://people-press.org/report/215/news-audiences-increasingly-politicized
from 2004 does not have more than 32% of the audience believing all or most of CNN and CNN was in the lead.