So few Canadians actually turn out to vote in school board elections that mobilizing your friends and relatives to get to the polls is often enough to become a trustee. 
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is that why they keep secret how many votes the Trustee won by in an election?
imagine
John Doe wins with 270 votes (family, his church, his soccer team, union...)
whereas with
other elections we see
John Average MP   45,000 votes