Please remember, Ronald Reagan was an actor before he became a politician.
Perfect delivery of perfectly memorized lines that sound good and look good, and doing it for so many years on the big screen and little screen that it becomes second nature for normal life, may be too high of a standard to ask anyone to meet who hasn't been a professional actor for most of their adult life before running for office.
I’ve seen non-actors do the same. If it comes from the heart you only need reminders.