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I am going to be Ms. Picky word maven. I don't think you really meant that Olbermann's editorial is a "screed".
A screed is a term of criticism, meaning a "long monotonous harangue", according to my dictionary.
Perhaps you meant "peroration". That means (1) a flowery and highly rhetorical oration, and (2) the concluding section of an oration; "he summarized his main points in his peroration".
I'm just doing my bit to turn back the erosion of our language.
Humourlessly yours,
Katherine Collins