It doesn't take psychoanalysis to figure out what Dan Rather's motivations were; the legal system has a process for recognizing bias.THE INDEPENDENT REVIEW PANEL which investigated CBS News's faked memos found no basis to accuse Dan Rather or Mary Mapes of political bias in connection with their roles in the offending 60 Minutes story about President Bush's National Guard service. In its report the Panel characterized the very question of whether a political agenda could play a role as "subjective" and "difficult." And panelist Louis Boccardi later explained that "bias is a hard thing to prove." Yet questions about motivation...