CIA as 'the perfect Watergate enabler'

In Max Holland's fine piece about Watergate reporters Bob Woodward and Carl Bernstein there appears this passage about the sausage factory of Washington journalism.

"That [Bob] Bennett (who later became a U.S. senator from Utah) was a Woodstein secret source has long been known. The much lesser-known House hearings on Watergate located a 1973 CIA memo di…