She introduced legislation that would delay any closures for at least two years.
3,700 post offices are on the chopping block.
Springfield's mail sorting facility is on that list.
But despite the rise of the internet for communication, McCaskill says rural post offices are still an important link for senior citizens and small businesses.
"While first class mail is going down, the mailing of packages is going up," McCaskill notes. "And these processing centers are very important to our competitive advantage that we have in the postal service. I am afraid if we went to 5 day delivery and quit guaranteeing folks that their mail would get there in 1 or 2 or 3 days, then pretty soon we're in a death spiral at the Postal Service."
Among other things, McCaskill would like to see the postal service relax its pension requirements to save money.