News media and journalism has the responsibility to back up its stories with reliable sources. That can mean anything from using substantive evidence to at least two opposing sources (if one doesn't comment, then that party is not represented; that's simplifying it a bit but you get the drift). There are rules journalists follow usually. Their craft demands it to protect them from lawsuits of libel and slander.
For the most part, bias, like beauty, at least in journalism, is in the eyes of the beholder, excepting editorials and bloviating anchors. However, journalism since the advent of cable tv and internet has taken many turns and is more sloppy than it used to be. Heck, when newsreporters are subpoenaed to testify about their sources, who wants to be a real journalist anymore, anyhow, if it means going to jail in order to protect your source? If there appears to be bias, then you should ask yourself why.
I'll add, that with advertising dollars down (the primary source of revenue) in newsprint and journals, I suspect bias is shown to clientele who help pay the bills or scratch the back in some other way.
And to answer your question, I do not know. But, I would think it is unethical, at the very least.
[This message has been edited by iliana (03-04-2006 05:59 PM).]