Katie Couric by Andrew Eccles/CBS and Tom Brokaw by Brian Ach/WireImage.com Katie Couric by Andrew Eccles/CBS and Tom Brokaw by Brian Ach/WireImage.com

Former NBC News anchor Tom Brokaw tells the Boston Herald he warned Katie Couric about moving from morning to evening news.

"I told her when she left that it's a dive off the high board," Brokaw said. "This is harder than it looks, to go from the morning to the evening."

He feels CBS shares some of the blame for CBS Evening News' declining ratings since Couric took over the anchor chair. "I think that they made a number of mistakes in terms of how they marketed her and what their approach to the news was."

Couric's low ratings have fueled speculation that CBS may replace her after the 2009 presidential inauguration. - J.R. Whalen

Related:
" Buzz Builds That Couric Is Eyeing Exit from CBS
" The Biz: If Couric Exits CBS, Who Could Fill the Anchor Chair?