"Behind any successful recruitment policy for election officials is the recognition that the appointees must not only be fair-minded and impartial in their dealings with the public and political parties but that they must be perceived to be so by all concerned. Thus, active campaigners or officials of political parties would hardly be considered impartial by the supporters of other political parties contesting an election, and so such individuals should not be appointed as election officials."
Commonwealth Secretariat: Organising Free and Fair Elections at Cost-Effective Levels, p. 44