This account expresses the idea that voter fraud would be very difficult to carry out in Pennsylvania - at least with respect to in-person election day voting (it doesn't seem relevant to claims of fraud with mail-in voting). However, this link describes a guilty plea of someone convicted of doing just that: https://www.justice.gov/usao-edpa/pr/us-attorney-william-m-m... So it would be interesting to reconcile this.…
Prior studies have only shown minor instances of voter fraud, I think something like 1000 documented instances of voter fraud amount 10s of millions of votes cast. With all the available information I have, I think it would be very difficult to fradulently product ballots on the order of 10s of thousands to actually swing an election.
Secondly, I think if we did have a widespread voter fraud problem I think it would also call into question past elections as well.