Today I worked as a museumguide in a small museum, telling people about the life of a female poet that lived in the first half of the 19th century. It is actually quite interesting, and most people really enjoy their visit because I don't just refer facts but try to make it a interesting narrative. But the truth is that there are only so many ways to tell a story, and as a museumguide you run through them all in short order. Visitors differ greatly from each other as well - which keeps telling the same story over and over again interesting.
It is difficult to keep things from going bland though - and sometimes I discovered myself not knowing what I said already because my mouth started working on autopilot and just spooled the story off. I do have a routine, a certain order in which I point out portraits and line up the narrative, but it is not as if I use the same exact words all the time. Sometimes I just don`t know if I have told a fact already or if that had been in the tour before that - quite emberassing! It usually happens when I am tired.
Politicians have to talk about the same issues all the time, and maybe they get tired as well and just stop paying attention to what they are saying and turn on their autopilot. They certainly use a specific way of narrating and speaking - which I find greatly annoying most of the time. It is no wonder that hardly any politican is a truly gifted speaker that can keep people interested.