Public broadcasting in the United States is not like state-run television in other countries, where the ruling party often influences the editorial stance and the quality of reporting. In the United States, there is an absolute wall of separation between politicians for elective office and the editorial process that shapes what is produced by public broadcasting.
We are all familiar with the conservative complaint about “liberal media bias”, which stems from a survey of voting habits that found many newspaper reporters were more liberal than the average American voter. There was never any evidence shown, however, that this influenced their reporting. Reporters, as a profession, are duty bound to report fact; it is editorialists, the kind of commentators that rule cable news networks and talk radio, that tend to infuse their “informational programming” with political bias.