>>I see a real problem in that in many countries (not USA only) the people have to choose what they think is the lesser of two evils - not the best candidate.
>
>Yes, democracy would be radically changed by one simple ballot change - offer the choice of "None of the above" and make it stick if it gets the most votes!
>The incumbent would continue to hold the office until a person was elected, which would have to be scheduled reasonably quickly and repeated as often as it takes.

If we had that, then the sitting President wouldn't be out of office probably until our tri-centennnial! At the earliest. ;)