Bari Weiss is a weird and worrisome choice as top editor for CBS News | Margaret Sullivan

When Weiss was named editor-in-chief, it was the latest turn in the network's confounding departure from its roots

If you're old enough to have admired CBS in its heyday, watching its decline has been painful.

Decades ago, it was dubbed the Tiffany Network - home of the great journalist Walter Cronkite (the most trusted man in America"), and innovator of the top-flight magazine program, 60 Minutes.