CBS News is losing heads, both in the newsroom and across America. Viewership plummeted at CBS News weeks after its chief, Bari Weiss, fired numerous producers and correspondents from 60 Minutes , according to Nielsen ratings data obtained by Status . Damage was particularly bad at CBS Mornings , hosted by Gayle King, which has long held the third-place ratings spot among network morning shows. But that recently changed: CBS Mornings averaged 1.8 million total viewers earlier this month, then