1. I’d like to think that people enter Politics due to the most pure of altruistic reasons, and that they want to selflessly serve their fellow Man.
2. That said, I believe that Robert Heinlein was correct:

Political tags – such as royalist, communist, democrat, populist, fascist, liberal, conservative, and so forth – are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire.