OMG I just had the best idea. Much of rhetorical power is in structure, so it should be possible to create a computer program where you can write a speech, then have it process it into a format that would create the desired result - being remembered and taken seriously. Things like repetition of key words, sets of three, rhyme, alliteration and assonance, even puns, those would all totally be programmable. ARGH wish I had the skills to do this.
Of course, it may already be done.