“Typically one of the quietest bureaucracies in Washington, the quasi-governmental Corporation for Public Broadcasting has been unusually active in recent weeks. CPB this month appointed a pair of veteran journalists to review public TV and radio programming for evidence of bias, the first time in CPB’s 38-year history that it has established such positions. PBS officials were unaware that the corporation intended to review its news and public affairs programs, such as “The NewsHour With Jim Lehrer” and “Frontline,” until the appointments were publicly announced.”