Certainly, they've all had speechwriters.
I have just been surprised re Obama. I was told for so long how brilliant he was, and he's no better than Bush. Worse, in some cases, when he goes off-teleprompter and freestyles.
57 states, anyone?
All those times he was looking left, looking right, during a speech I was impressed. It wasn't until much later I saw the teleprompter was at virtually every appearance during the campaign. I think it was the rodeo appearance that made me aware he is nothing but a newscaster with a great voice.
Not great hair like my local anchor, though.