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The US Postal service receives no government funding, but it has a large labor union, and it is a constitutionally mandated government agency, so in an attempt to kill the postal service, Republicans devised a new mandate in 2006 — for the prepayment of health benefits for future retirees, with the Postal Service being forced to pay between $5.5 billion and $5.8 billion annually. The money simply goes into an escrow account, where it is invested in special issue Treasury securities. Thus does it somehow magically help with the deficit. Also, of course, no sooner did the bill become law than first class mail began to fall off the cliff. The prefunding requirement became a noose around the Postal Service’s neck.
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http://johnhively.wordpress.com/2012/11/26/republicans-against-the-constitution-and-the-us-postal-service/