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reps may be accomplices, especially if we are talking about large parties or their known satellites, to whom losing is not an option
small party reps may be for sale as these parties are desperate for more votes
volunteers are an unknown factor, they may or may not be involved in suspicious activity
what happens when there are too many volunteers?
Not sure about your comment regarding small party reps. If they're desperate for more votes, they would be corrupt in their own favor, but if they're up for sale, wouldn't the "buyer" want to get votes for
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some pre-election polls are known to be fairly accurate, up to a few percent error, thus there may not be a need to even attempt hard fraud, at least in the absence of a tight race
in the USA, with their mandatory two-party system or elsewhere with 1-2-3 traditionally large parties, all it takes is to have sufficient access to influential persons within those parties - then it does not matter who wins, something along the lines of:
Polls can give a good outline but also say whatever who's behind them wants them to say, so they should be handled with care. On 2015, a lot of independent/third way voters here ended up voting for Macri since polls predicted his victory, therefore "he's going to win anyway, so might as well" (a terribly wrong reason to choose any candidate, but that's a different issue), which was one of many factors that secured him the margin needed to actually win.