For a fifth week in a row ratings to “CBS Evenning News” with Katie Couric have dropped. Katie Couric moved from NBC’s “Today Show” to take over the helm of the “CBS Evenning News” on Labor Day and got 13.6 million viewers for the premiere; Since that high point viewership has been steadily sliding to last weeks 7.04 million viewers, behind ABC World News Tonight at 7.97 and NBC Nightly News at 8.56 million viewers.