Last weeks ratings for Katie's latest week on CBS Evening News was below interim anchor Bob Shieffer's last week prior to Couric's ascension. Since Katie Couric opened on CBS Evening News the day after Labor Day to blockbuster ratings of 13.6 million viewers, her viewership has diminished from week to week. In fact, this week's average of 7.04 million watchers was third behind NBC's Nightly News (8.56 mil with host Brian Williams) and ABC's World News (7.97 mil with host Charles Gibson). SNL joked that the ratings had got so bad that Katie's new nickname was "Dan Rather." Try to forgive Schieffer if he can't hide his smile.
Cf. http://news.yahoo.com/s/ap/20061009/ap_en_tv/tv_cbs_couric_2 and http://www.calendarlive.com/tv/cl-et-evening11oct11,0,1209222.story?coll=cl-tv-features.