I'd say because they are "handled" their people do everything for them, think for them, write for them, advise them, manipulate them... they say Reagan was half senile before he left office because the Alzheimer's was kicking in...I don't know if it's true but it's all like a big machine and they pick their candidates according to who they think they can make a winner... there's so much polishing and psychology involved it's amazing
even running for mayor in a big city...you have handlers... they vet what they can or should not say... puppets in many cases placed there by big corporations all looking for their piece of azz
I know I sound jaded and I guess I am
we need a new system