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Um, no. The journalist and the media outlet rely on the trust of the public to ensure their livelihoods, and that's why they should never, never, never, trust ANY SOURCE!
A journalist's role in sourcing is to provide a diversity of insights and opinions from various sources, not to provide one source as the sole arbiter of the issue. That is the exact opposite of ethical journalism, and exactly what passes for mainstream--especially network journalism--today!
And in case any of you schmucks are still reading, this is a handy little website to bookmark--
The Society of Professional Journalists Code of Ethics:
http://www.spj.org/ethicscode.asp