According to Bob Woodward and Carl Bernstein in their 1974 best-selling book All the President's Men, Clawson bragged about having written the Canuck letter to a friend, Marilyn Berger, who happened to be a Washington Post reporter, whom he had known from his days with the newspaper.
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Berger reported that Richard Nixon White House staffer Ken Clawson had bragged to her about authoring the Canuck Letter, a forged letter to the editor of the Manchester Union Leader that played a large part in ending the campaign of Senator Edmund Muskie.