[QUOTE=Sarahfeena]
I guess I don’t see the value of having to ferret out bias in a piece. When I read news and commentary, I’m looking for facts as well as various points of view on an issue, in order to be well-informed enough to form a solid opinion on it. I would much rather know where the writer is coming from, which will help me determine if there seems to be bias, and whether or not I need to go look for some opposing views. I read a lot of opinion columnists, and knowing what the POV of the columnist is helps me to know how big of a grain of salt I need to take it with.
[/QUOTE]
The columnist is telling you what their POV is, you just have to read the article. scratches head I just don’t understand, yet, what advantage your looking for here.
If you consider yourself “liberal”, and you see an opinion piece that has the warning label of “liberal”, are you going to assume that it is more factual? Less?
Isn’t there a danger that, based on whatever “label” is on a piece or news organisation, that label will bias you? By that, I mean if, based on your preconceptions of those who use that label, you will become unfairly critical (or more likely to unquestionally accept) the info or opinion presented?
Let me try my (weak) analogy skills again.
The members of the SDMB already feel that Fox News Channel has a conservative bias. FNC, because of your watching it over time, already has that slant applied to it. You don’t need the “label”, you already accept or reject what they say based on your own opinions of their integrity.
What do you, personally, expect to gain by FNC coming out and point blank stating 'this piece contains elements of conservative opinion"?
Are you just looking for a “Hah! I knew it! You guys are NOT F&B!” 
Consider my own (mlees) posts, here on SDMB. Over time, some folks (if they actually give a hoot and paid attention to the posters’ names) will come to sense a little of how I may perceive things. A couple may think, when they see my login name on the post, may think “Great… here comes the ‘peanut gallery’ again…”. And that perception of me (and my opinions) is based entirely on what I say, how I say it, and so on. Any bad (or good) impressions I leave around here are (mostly) of my own doing. I feel it’s the same with the news agencies.