Politics puzzle

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Across
  1. 2. head of a state
  2. 3. group of parties who are not in government
  3. 8. set of beliefs trying to explain the world
  4. 10. group of people trying to get political attention
  5. 11. mechanism to determine a leader
  6. 12. law which is supposed to be implemented
  7. 13. institution that passes laws
  8. 15. person responsible for affairs of a thematic area
  9. 16. survey about the peoples will on a topic
  10. 17. political system ruled by only a few people
  11. 20. people trying to force political change
Down
  1. 1. institution working on a specific topic
  2. 4. organisation and management of a country
  3. 5. system with the people as sovereign
  4. 6. group of people ruling a country
  5. 7. document about the framework of a state
  6. 9. union of several countries
  7. 14. political parties working together
  8. 18. document between several countries
  9. 19. basic properties an individual has