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Get the vagueposting out of here.
It's one of the core superpowers of the Australian electoral system: you can be fined for not voting, but also just about _any_ excuse will get you out of the fine - the fee itself is considered to be administrative and waived once you provide a valid reason.
But the system itself means that voter suppression is vastly more difficult: people are inclined to turn up. Or at least participate with the system. And the elections themselves then have a check system built in - if a whole district is getting fined, well now that's news - people complaining to media, sending letters etc.
While I'm aware many (most? all?) polling locations allow for early voting, the reality is that many people wait for election day, and the combined hassle of having to work that day and deal with sometimes multi-hour waits (due to Republicans repeatedly closing and limiting polling locations) inevitably leads to some not voting.
Of course that also ignores many of the other issues with our electoral system that convince many they shouldn't bother voting (e.g., the electoral collect and heavy gerrymandering disenfranchising large swaths of people), but those are a larger and more complicated set of issues to address.
Making it a kind of super holiday where we mandate closure of everything from gas stations to non-emergency hospital services might help, but you're never getting the votes to make that change.
How about having elections on Sundays instead of on Tuesdays?
Hilariously wrong, and if it were true it defeats the purpose of making it mandatory.
A huge difference between here in Oz and there in the USA _as I see it_ is that we are conditioned to vote, whilst you are conditioned to vote if you care enough. The fine here is just enough to be annoying, and given the streamlined process at most polling places (you still get queues) it's usually much less hassle to go to the local polling place (town hall or primary school usually) for half an hour. Given the existence of early polling and postal votes there's really not much excuse for _not_ voting unless you're religiously opposed - although I have avoided fines by calling ill-health.
This has been litigated and investigated over and over and there's never been a shred of usable evidence. Fox and others were sued and lost unable to prove anything. Trump ran a voter fraud commission in 2016 and they just gave up with no findings. They have nothing. They have all the resources in the world to bring to bear and they can't prove a single thing.