Ted Koppel is going to receive a lot of encomiums as he steps down from “Nightline” tonight. It may be especially passionate with how dramatically our long-standing TV news incumbents have left the building in the last year. Standing for serious long-form newscasting will do that for you. But in case you feel someone’s left out how Koppel could actually display some pretty serious liberal bias, there’s always this quick review, filed after Koppel boasted of his integrity at a CPAC panel.