In the media age, dreaming of things political is becoming more frequent. Since we are often exposed to the intimate details of public figures' lives, we feel we know them, even if we only know about them.
Consequently, we work these figures into our dream lives when events in our lives seem to empathize with what we know of public figures.
Often, politicians, like celebrities, pop into our dreams for no reason other than the fact that we are bombarded with images of them on a daily basis. What may be important, though, is your waking-life perceptions of the politician who appears in your dream.