The Pennsylvania Department of State says around 16,000 mail-in ballots had to be thrown out in this past election.
The ballots either did not have the secrecy envelope or they lacked the proper signatures or dates.
Democrats felt more of the impact of the miscast mail-in ballots, with two-thirds of the 16,000 coming from their party.
Many counties tried to work with voters to cure the ballots if they were turned in early enough.
