And Opinion Talk Radio isn't?
Limbaugh self-describes as an entertainer. He clearly is not a journalist or other supposedly-higher-standards media member.
I think you're making a very thin semantics argument between Comedy-News-Opinion Entertainment and Political-News-Opinion Entertainment.
For example, you'd be very hard presse to tell me the real differences between Limbaugh and HBO's Bill Mahr. Or between, then, Bill Mahr and the Daily Show. Differences, I should stress, not based upon political support for one side and political disdain for the other.