George Carlin was not only funny, but also keenly incisive about human nature:
"I love human beings one at a time. Individuals are fine, but then they get into groups. And then they have an agenda—which is usually to do something to other people."
Politicians are mildly bearable one at time. But when they get into groups (e.g. legislatures, or Congress) and the mischief starts. Dangle money, power and fame in front of them and it gets horrible. I recommend you get this book and read pages 61 and 62 if you want to eavesdrop on how it works.