Back in the thirties when radio and newsreels came into play. Leaders spoke a certain way, and used over-exaggerated theatrics when they spoke. Look at a newsreel of say, Huey Long speaking back in the early 30s. Not much difference in the delivery from Hitler. It was a different time back then.
Huey Long was not your typical politician either. He used radio before almost any others and was more of a demogogue than the rest. Hitler was closer to Huey than other politicians in style and awareness of radio's potential. Nor were there any other orators as violent in their language and motions as Hitler not even Huey.
Read descriptions of Hitler's speeches. He would walk to a stage in a subdued, mild manner and begin speaking almost sniffing the crowd's attitude. Once that was established people described the change which took over him as almost supernatural as though he was being possessed by some demonic spirit. He would seize the crowd emotionally so much so that men cried and women fainted. Indeed, Hitler was an unusual man.