Skepticism is a necessary trait in this type of work, for sure. I will say that the performance has improved substantially in the past year, and there are still PDFs that require a lot of work.

We went with official precinct results for two main reasons: there are differences between election night and final results (some of them non-trivial) and to make the work more manageable. Agree that historical results are a real problem, and as a PA native I know only too well the errors that the state data contains, which is why we go county-by-county there.