sean2015 I believe Dan Fenn is still alive and may have worked on the 1960 campaign. Fenn was a member of JFK’s White House staff. He also worked for a long time at the JFK Library www.wickedlocal.com/article/20130328/news/303289550
It's strange too, I remember only this past winter thinking about Dick Goodwin and realizing that he was probably the last surviving member of the Kennedy administration (I had missed the news about his death and only found out by googling him after watching the film _Quiz Show_ )
sean2015 according to this video from early 2018, Mr Dan Fenn is apparently alive & well ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xPWTR3SLJk0.html