If it is understood that “writers write” and “teachers teach,” then it can be safely assumed that “politicians politician,” which is the ability to seek or hold state or government political office. In the definition of the title there is no assurance that politicians are responsible for the whole of the Commonwealth. So don’t get mad and foam at the mouth over your T.V. dinner when they execute their jobs well and don’t want to do strenuous auxiliary work, like taking care of an entire nation, because that is by definition not their job. I mean, you don’t even want to work weekends.