Comment Re:Perfect (Score 4, Insightful) 500
Well in Canada we do factor in error. It's called spoiled ballots. And the election is not a statistical analysis of the votes of the population, it is the actual votes. There is no margin of error. You mark your ballot with an X in the proper bubble, which is beside the name and party of the candidate. It's nice and big and so is the name of the person. There are many signs at the polling station that tell you how to vote in very easy to understand pictures and the people running the polling station can easily tell you how to do it without referring to any candidate. If you mess that up, your vote doesn't count.
Margin of error puts the onus on the system. For an election to work the system must be held to a standard of infallibility and that all errors fall on the voter, if it's found not to be the case and is significant to have possibly affected the outcome a re-election is called.
So the margin of error is factored in, but more is taken into consideration than a mathematical equation.