In terms of political talent, I’d say FDR and JFK also qualify as “once in a generation political talents”, along with Obama and Bill Clinton. And if a generation is about 20 years, then the math works out pretty well.
So MOST of our Democratic Presidents have been unique political talents. Sounds like our current nominee isn’t really on the right hand side of the curve as far as presidents are concerned.
Who knows. I hope I am wrong and Hillary turns out to be everything that my facebook friends hope she will be but her history does not point in hat direction.