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1} Do you think this policy is a good idea for the media to adopt as a general rule?
I don't believe that it is a good rule at all. As has been pointed out, the use of an anonymous source was responsible for the
uncovering of watergate. This completely doing away with unnamed sources tosses the baby out with the bathwater when the simple answer is to just institute some fact-checking measures such as
top editor check-offs and double-sourcing are simple ways that could be the answer to this.
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2} Should the media apply this only to Washington, or across the board
3} What do you think drives the "unnamed sources"?
The question is this:
What is the ultimate purpose of them providing information to you? If you are a news outlet and a White House insider is trying to dish the goods on other country that the President wants to go to war with, I'd think you would know when you're being played like Chris Matthews and being used for other purposes. . .theirs!.

If someone is a "whistleblower" then I think you would run with that, if they could provide you with items that you can double check on and find to be true. A key component would be to see if they can provide a brief working history with you where the information was accurate.
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4} How do you think the rest of the media will respond to this suggestion?
Unless you work for a media outlet that has been burned on a a particular issue of misreporting, I don't believe it will affect the rest of the media world. They feel that their own system of fact checking works and in some cases, it probably does.
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5} If adopted mediawide, how do you think this will change the political dynamics?
This topic has been around for awhile, I can't say that there has been a lot of publicity about this. Given that fact, I doubt it will change the political dynamic all that much.