Definitions

Definition of perfect election: A perfect election is when every voter who was legally deserving of the right to vote and who attempted to vote in a legal manner had his or her vote counted for the candidate who he or she intended to vote for.

Legally deserving of the right to vote means that the person had followed the established, legal procedure for registering to vote in the jurisdiction and was qualified to vote in that jurisdiction according to the laws in that jurisdiction. If a person didn't attempt to register to vote, they would not be legally deserving. If they did, but it was lost in the mail, they would be legally deserving.

attempted to vote in a legal manner means that the person showed up to the correct polling place or followed the rules for obtaining and submitting an absentee ballot, etc. If someone requested an absentee ballot and it was lost in the mail, this would be considered as attempted to vote in a legal manner. If someone showed up at the wrong polling place, this would not be considered as attempting to vote in a legal manner.

The candidate that he or she intended to vote for means that the vote is counted for the candidate who the citizen intended the vote to go to.

All of this is theoretical - only G-d knows who would have won an election if it had been perfect.