Note that Olbermann won in the 25-54 demo on 10/21. If I am not mistaken, that's the second time he's beaten O'Reilly in the demo in the year or so that we've been tracking this race. If commenters know about any extraordinary circumstances for either show on that day, please let us know. However, the long term trends for both shows in the chart below don't show any convergence in their long term lines. I know I promised some shorter term interpolations in that chart, but it's late, I'll get to it next week.
Long Term Trend of O'Reilly vs. Olbermann TV Ratings:
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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.