Having worked in elections in previous life for a decade or so, every election has irregularities in it. They are not conspiracies or results of election workers trying to change the outcome. Election workers do their job because they believe in the process and frankly are too busy to even think of doing something untoward.

Most people don't see it because the media doesn't care unless there is a race that is close and of a large enough stature. If you are working in a county that happens to have problems and a race for a statewide office is close the media will be all over you, which consequently makes resolving any issues that much harder.

Voting systems are tested before each and every election and sealed until election day. However, just like a light bulb it may have worked when you turned it off but the next time it is turned on it could fry. You can also never test a system with a full load like a real life situation. You can test them with a simulated load but it is hard to duplicate 1+million people voting right now.

Merch
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"But these go to 11" - Spinal Tap