Although the chattering continues about her future, Katie Couric is still in the anchor's chair at the CBS Evening News. Yet that hasn't stopped colleagues and contemporaries from talking about the possibility. Former CBS news anchor Dan Rather endorses 60 Minutes correspondent Scott Pelley for the job, while lefty bloggers believe Keith Olbermann is the natural fit. Former NBC anchor Tom Brokaw says he warned Couric not to take the job. Meanwhile, First Lady Laura Bush will take over Couric's ...