The Watergate affair, however, highlighted the need to strike a balance between national security concerns and American's civil liberties.

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Sixty-three percent of those interviewed said they were somewhat or very familiar with the Watergate affair, while 36 percent said they were not familiar with it.

CNN: Multimedia

He contrasted the affair with the Watergate scandal in which a "brave" newspaper - the Washington Post - "protected the public".

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