I think that you are going to find lines or quotes from the work that will demonstrate the themes of how political power is something that is constantly fluid. It is an entity that is coveted by those in the position of control. Napoleon certainly demonstrates this as he ascends to power and seeks to consolidate it:
The animals would still assemble on Sunday mornings to salute the flag, sing “Beast of England,” and receive their orders for the week; but there would be no more debates.
From chapter 5, this quote helps to bring out how Napoleon recognized at an early moment in his control of power that the principles of the revolution, the same spirit that helped elevate him to power, could not be the same realities that he could use to help keep him in power. Such a quote connects to Orwell's theme of how politics and political rule are often constructs of the individual who seeks to maintain and advance their own political control.