This article by Blake Hounshell and Nick Corasaniti is published by the New York Times. Here is an excerpt:

It’s been more than nine weeks since the Pennsylvania primary. The election is still not certified.

The reason: Three counties — Berks, Fayette and Lancaster — are refusing to process absentee ballots that were received in a timely manner and are otherwise valid, except the voter did not write a date on the declaration printed on the ballot’s return envelope.

The Pennsylvania attorney general has argued in court amid a lawsuit against those three counties that the state will not certify results unless they “include every ballot lawfully cast in that election” (emphasis theirs).

Read the full article here.