It's all about 'eye contact'. Rudy for the most part can speak without notes and a teleprompter, he focuses on getting his message out to the audience and 'connecting' with them. It is a rare gift.
He spent about four months once 'learning' his 'state of NYC' speech so he could give it without notes and concentrate on the message and the audience. I think no one will be able to match him in this. Remember he was a prosecutor and had to do a lot of 'convincing' in his day. :)
Those days as a prosecutor are showing through when he speaks. He also keeps your attention and doesn't give a slow speech which I detest. I like animated speakers that make their points. I love hearing him speak and cannot say that about many politicians.