The only clips we ever see is of Hitler screeching and screaming. I understand he had the orators sense of when to swell and when to diminuendo... that he would "play" those huge crowds. Bellowing one minute, sentimental and weepy the next, they fell for it.
I read about hitler giving those speeches...he had to have extra thick underwear in the front and it wasn't because of a weak bladder
Tony Blair is most effective when he is in parliament, which is a church like setting.
I think that a great orator could very well manipulate television and use it to great advantage. Great orators studied other orators. Hitler studied Mussolini, Mussolini of course had Cicero. Perón was military attaché to Italy and got to see Il Duce up close. Nasser studied Perón's success and copied it.
There are no great model's to play off of and copy today. Also the skill or oratory and debate is not taught as much as it once was even in law school, though it is a skill that lawyer's should excel at.