That was claimed recently in an article in
The Atlantic, which says that before he died Atwater claimed to have done the following, "contriving an invitation from Broadhurst for Hart to come on a boat ride, when Hart intended to be working on a speech. Ensuring that young women would be invited aboard. Arranging for the Broadhurst boat Hart thought he would be boarding, with some unmemorable name, to be unavailable—so that the group would have to switch to another boat,
Monkey Business. Persuading Broadhurst to 'forget' to check in with customs clearance at Bimini before closing time, so that the boat “unexpectedly” had to stay overnight there. And, according to Hart, organizing an opportunistic photo-grab."
This seems like a desperate attempt by a dying man to satiate his notoriously outsized ego. How exactly could Atwater have not only done all that but completely get away with it for 31 years? And unlike with Dukakis and other candidates Atwater actually did destroy, Atwater never apologized to Hart. Which seems strange since it was Hart who suffered the most humiliation. IMO, Hart did himself in and Atwater wasn't involved, though I'm sure he wished that he had been.
Here is the article I referenced:
https://www.theatlantic.com/magazine/archive/2018/11/was-gary-hart-set-up/570802/