I'm not so sure about JFK, certainly he was a visionary, but he bought us pretty close to a nuclear war over Cuba and there are always lingering doubts about any Mob connections.
I was too young to appreciate Supermac, like many politicians from that time, they in general seemed to have a greater sense of duty. Then again ,all politics has its generational problems/scandals etc it was John Profumo in '63 that eventually brought Harold Macmillian's government down.