[Bobalu]

Although he speaks without a script

If you just speak the truth and simply say what you really believe in then you don't need a script/teleprompter, or a great memory ;-)

If you spout lies you better have a teleprompter to help you keep the lies straight, and a great memory so you don't lose track of all the lies and give away the deceit.

[entropy12]

No kidding! That is why you will seldom catch Barack without 2 big teleprompters.