Well for example there are a more than a few definitely dead people who vote each election, that's pretty easy to show. But finding the, uh, living person who did the fraud is not always easy.
[1] http://www.g-a-i.org/wp-content/uploads/2017/07/Voter-Fraud-...
And look, I’m not saying this is a significant factor or anything, but we’re arguing about it now so whatever.
Every state has an electronic pollbook that tracks voter eligibility. Votes for dead people will arrive, but they should not as a rule be counted.
Edit: I mean I am okay with leaving it as “somebody on the internet says”, but wondered if the evidence was more clear than that.
https://www.swgfuneralhome.com/obituary/Denise-Ondick
https://twitter.com/clewandowski_/status/1325256319176224770...
The tweet has a screenshot, and unless they’ve already corrected it, you can probably find it on the PA website yourself.