> Clearly, sample size alone doesn't have that much of a correctness guarantee, or according to your own statement, we'd be able to trust the official results.
People are not complaining because the election is a biased sample of the population (not possible because by definition an election is open to all eligible voters).
People are complaining because they believe the government is not truthfully reporting the actual election results.
Yes, this is the point I am making. Sample size is but one of many factors that influence the reliability of a poll, and it is not the only consideration for good polling technique. A large sample does not mitigate those factors.
If there is an issue with the underlying polling technique, making the sample larger does not guarantee more correctness. You simply end up with a larger set of bad data.
Forget the percentage - there are more people who said they voted for the second-place contender than the second-place contender's official vote count.
People are not complaining because the election is a biased sample of the population (not possible because by definition an election is open to all eligible voters).
People are complaining because they believe the government is not truthfully reporting the actual election results.
Good polling technique cannot mitigate fraud.