I just finished SILENT COUP. Nixon, Haig, Dean—all had skullduggery to hide—wiretaps, etc.—but Dean ordered the DNC break-ins. He also had his fingers in everything—the Bailley trial, etc.—all of it related to Mo Dean’s career as a call-girl. Dean is the great villain in Watergate. Nixon was blameless, and completely deceived from beginning to end.
G. Gordon Liddy used to say that people would compliment him on how well his sons turned out. He explained that “during their most formative years, I was in prison.”
I don't think that they ever uncovered any role by Haig in Watergate, but it does illustrate that Woodward was known to people inside the Nixon White House before he began his career as a Washington Post reporter.