How does voting work?

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Across
  1. 3. Servants the winners of an election
  2. 4. _________government
  3. 7. _________in chief
  4. 10. Number of branches in the US government
  5. 11. The president is in charge of this branch of government
Down
  1. 1. in charge of the armed forces
  2. 2. mail in your vote using this
  3. 3. where you cast your vote
  4. 5. Sometimes called 'casting a ballot'
  5. 6. this is how old you have to be to vote
  6. 8. the legislative branch of government has this
  7. 9. this is a full member of a country
  8. 12. You have to be a US citizen to do this