Perhaps concerned over his prospective role as moderator of a presidential debate, CBS's Bob Schieffer told the Sioux City Journal that CBS News has an affirmative duty to prove its memos are genuine:

"I think we have to find some way to show our viewers they are not forgeries,'' Schieffer, CBS' chief Washington correspondent and host of the network's "Face the Nation,'' said at a news conference in Sioux City. "I don't know how we're going to do that without violating the confidentiality of sources.''

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