(courtesy of Veritiv Key Notes)
This question has been asked at the highest levels of operations in the Postal Service. The USPS has received cooperation from political mailing partners regarding upcoming large volumes, with entry points and destination ZIP Codes. Armed with this information, they will allocate resources to process all mail within the standards of the class paid. Those resources could include increased transportation capacity, additional personnel and extra hours. The USPS stated customers can be assured that their mail will receive the delivery standards for the class that is paid.
Source: USPS Business Alliances.