McGinniss, who announced in 2013 that he had been diagnosed with inoperable prostate cancer, yesterday died from complications related to his disease. His attorney and longtime friend Dennis Holahan said he died at UMass Memorial Medical Center in Worcester, Massachusetts.
Few journalists of his time so intrepidly pursued a story, burned so many bridges or more memorably placed themselves in the narrative, whether insisting on the guilt of MacDonald after seemingly befriending him or moving next door to Sarah Palin's house for a most unauthorised biography of the former Alaska governor and Republican vice presidential candidate.
In both cases, he had become fascinated by the difference between public image and private reality.
McGinniss was a columnist for the Philadelphia Inquirer in 1968 when an advertising man told him he was joining Hubert Humphrey's presidential campaign.
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Intrigued that candidates had advertising teams, McGinniss was inspired to write a book and tried to get access to Humphrey.
Garment and other Nixon aides were apparently unaware, or unconcerned, that McGinniss' heart was very much with the anti-war agitators the candidate so despised.
The Republican's victory that fall capped a once-unthinkable comeback for the former vice president, who had declared six years earlier that he was through with politics.
Having lost the 1960 election in part because of his pale, sweaty appearance during his first debate with John F. Kennedy and aware of his reputation as a partisan willing to play dirty, Nixon had restricted his public outings and presented himself as a new and more mature candidate.