11/10 Update: Keith Olbermann has signed on with MSNBC until 2011.
Long Term Trend of O'Reilly vs. Olbermann TV Ratings:
We have data since late November, 2007 but using that as a "start" point for a linear trend would be arbitrary. The trend lines above are 20 day (4 week) moving averages. I'm not sure I'll stick with that period, it might be too short, but that's what I'm going with for now.
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Nielsen Cable Network Coverage Estimates (as of March, 2008)
CNN/HLN: 96.93 million HHs
CNBC: 95.13 million HHs
FNC: 94.55 million HHs
MSNBC: 91.59 million HHs
Nielsen TV Ratings Data: ©2008 The Nielsen Company. All Rights Reserved.