In Dual Universe, the political system is far more flexible than most games because the relationship between organizations is almost completely customizable. Unlike other games, merging two groups, regardless of size and complexity, doesn't require that members or groups leave one organization to join another. Any organization can become a member of any other organization, without having to remove or change it's relationship with it's own member organizations. Organizations are also free to customize the rules for their own internal governance, which allows for the creation of a multitude of government types.
For example: Several organizations, each with 50 to 100 members, decide to join together under one organization known as The Star Federation. Once joined, each smaller organization can continue to operate just as it did beforehand, as their internal structure doesn't need to change to be a part of a larger organization. The members of the Star Federation can set up a system that allows them to elect players to a governing body from each of their member organizations without those players having to leave their original org.
Some time later, the Star Federation decides to join with another organization of similar size, known as the Imperators. Together, they create and join an organization known as the Space Lords. Because of the freedom provided by the DU organization system, there are no adverse effects to the structure or members of the Star Federation, the Imperators, or any of their many member organizations. This process can happen a dozen more times with much the same effect.
This flexibility allows for an extremely customizable, complex, and immersive political system. Governments and nations can evolve and develop in much the same way they do in real life, with a theoretically unlimited level of complexity. Players can create and join their own systems that govern everything from local affairs to intergalactic politics, with separate political systems for each level.