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Bitter, etc. writes:
"Do you guys have any investigative reporters?"
To be fair, this isn't an investigative piece but an essay about two books.
So when Shapiro writes "From McAuliffe, we learn who gave the money, but rarely the whys," he's just stating a fact about the book. It's not the job of the reviewer to answer the questions left unanswered by the reviewee. It would be the job of an investigative reporter to fill in such blanks.