here that, in sf, we enjoy the familiar in the exotic. What of future politics? Wells has a World State. Heinlein has a Federation from which the US secedes when it becomes a theocracy. Decisions of the Advisory Board in Poul Anderson's Terran Empire will affect interstellar, inter-species relations into an indefinite future. In fact, might future politicians debate not only immediate policies but also the direction of evolution and the nature of humanity?
In Julian May's Galactic Milieu Trilogy, if the Human Polity merges fully with the telepathic Galactic Milieu, will human beings lose their individuality? Asimov's Second Foundation and Anderson's Psychotechnic Institute try to direct not only the social but also the psychological development of humanity. Asimov's planetary consciousness, Gaia, aims to supersede the Foundations by becoming a galactic consciousness able to resist (unlikely) extra-galactic invasion.
More on this later.