After both being in repeats the previous week, Conan's Tonight Show topped Letterman's Late Show in the adults 18-49 demo for the week ending October 30. Their four week averages continue neck and neck.
There was some spirited debate attached to my original post about the disappearance of Conan's adults 18-49 lead over Letterman and whether it might be the start of a long term trend. That's still an open question.
The trend lines above are 4 week moving averages.
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Nielsen TV Ratings Data: ©2009 The Nielsen Company. All Rights Reserved.