The New York Times reports:
The U.S. Postal Service experienced some of its worst delays all year in the final week before the election, according to a Times project tracking first-class. An avalanche of late-arriving political pamphlets and advertisements appears to have added to backlogs for the Postal Service, after months of slowdowns.
The week beginning Oct. 26 was the slowest week recorded for local mail, which the Postal Service aims to deliver within two days.
But a delay of even one day for ballots in the final stretch of the presidential election could make the difference between a vote that is counted and one that is not, especially as legal fights continue in crucial states over whether to count ballots that are postmarked before Election Day but arriving after it.