This speaks for itself
Granted, public speaking is difficult. Avoiding the "uhms" and "ahhs" is a challenge. Most politicians learn to simply use bullshit rather than the unfortunate "uhm".
"That's a really good question"
"I wish I had one of those 60 second responses with a 30 second follow-up"
Basically, say something, even if it is non-responsive. Don't just stand there and go "uhm".
Fred Thompson is no Ronald Reagan, though he is in the same mold. An actor playing the role of the POTUS while someone else pulls the strings. Makes you wonder who is pulling the strings, don't it?