Whether something is mainstream or not isn't entirely relevant because the definition and power of elements of the mainstream aren't clearly defined. Even so, while numbers don't necessarily determine mainstream status they are undeniably an indicator of reach. Factually speaking, Limbaugh has a large enough audience and the rhetorical reach to influence local and national policy discussions. Anyone who doubts this has clearly not been paying attention to recent national discussions.
The fact that he has a financial incentive to say outrageous things just decreases the likelihood that Limbaugh will add anything of value to the discussion.
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