Americans rate the United States Postal Service as their favorite federal agency. Its workforce of more than half a million is scattered across the U.S., making it the biggest employer of any government entity except the military. And it will play an outsized role in Americans’ ability to vote safely during the worst global health crisis in 100 years.  Yet the USPS is undergoing transformations, and not necessarily for the better. Its newly appointed postmaster general is implementing changes that have slowed mail delivery, which is problematic on at least three levels: First, the changes will damage the vote in terms of delivery time, votes held back, and a possible…