Kind of like Edith Wilson.

[Ocelot II]

At least in his second term, in public appearances Reagan often seemed vague and somewhat befuddled, but he never came across as completely barking mad like Trump. He never went on word-salad rants, made up obviously crazy stuff, or insulted reporters or most of the rest of the world. I was not and am not a fan of ol' Ronnie - he did enormous damage, especially to US economic policy. But he was only borderline senile, not absolutely and dangerously nuts.

In 1986 SNL did a clever skit about Reagan pretending to be clueless and confused while he was actually an evil genius mastermind.