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Mr. Manjoo's article reminds me of a man I knew who wouldn't leave his cheating girlfriend or quit working with his lying business partner because he could never find absolute proof of thier duplicity.
Farad Manjoo writes mostly about tech affairs, but human affairs aren't like science experiments that can be repeated in a lab. What people do and say when no recorders are running is ultimately unprovable. You'll take years, and far beyond the next several elections to sort out the mess of nitpicking dismissals Mr. Manjoo presents here.
Demand a "smoking gun" and risk being a sucker next time, or be like most people who live in the real world; use your judgement based on less then perfect evidence.
Evidence that's pretty overwhelming in the big picture.