Well they were:
Political impersonations on “Saturday Night Live” used to be a good deal more impersonal. Dan Aykroyd’s version of President Carter had a half-Southern accent and a whole mustache. Chevy Chase’s version of President Ford was pure whimsy, as if someone had simply said, “Jovial. Clumsy. Go!” They were making fun of Presidents, but they were also making fun of Presidential impersonation, a hoary showbiz tradition that had come to seem unhip.
- The New Yorker
But later the impressions got "better."
In the nineteen-eighties, the impressions grew more precise: there was an avalanche of Reagans, and then there was Dana Carvey, who found a quirky nerd lurking within the seemingly unquirky first President Bush.
Like I said: '80s worst time for comedy.