Fascists tend to get gerrymandered into cozy polling districts with very short wait times.
Does dissuading fascists from voting actually help? The more important part is convincing proles that voting is immaterial and they need to do other stuff to effect change. Whoever and however anyone votes, fascists will get into power.
This would work on liberals who use voting as a way to virtue signal and not chuds that understand the entire system is catered to them so that their vote counts way more than everybody else's and it's a way to hurt people they don't like.
Libs vote for the sticker, chuds vote in the hope of using the power of the state to inflict violence on people they dont like.
Be careful this doesn't get considered "voter disenfranchisement" and get attention from the local piggies.
If you want to be spicy First Amendment style, maybe hand out a zine or one-pager explaining why electoralism is a dead-end, how corporations own both parties, and Capitalism is the ultimate enemy of everyone in line?
Tbh I think the zine is more likely to get you in trouble. Many states ban any kind of campaigning within a certain distance of a polling place. But I don't think handing out "I Voted" stickers would qualify as campaigning. A zine, on the other hand ..
There's markers that clearly mark where you can and can't do "electioneering". Poll greeting at busy locations is common. You'll be fine.
My victory plan involves driving my 
to the polling station and 
[redacted]
i don't think we could dissuade enough people for Claudia to win
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