The ruling could impact the race between Lehigh County judicial candidates Republican David Ritter and Democrat Zachary Cohen.
The ACLU contends 257 unsigned ballots from Lehigh County should be counted.
Lehigh County’s November election has yet to be certified because of the legal fight.
The ACLU filed suit in federal court on behalf of five voters who did not date their ballots.
The ACLU is concerned that voter information can be kept safe.