There's more to this story than meets the eye.
Sam Seder explains how right wing corporatists deliberately destroyed the US Post Office at the behest of their lords and masters, in this case UPS and FedEx.
If that's too much video for you, the material is covered and then some in "Postal Workers, the Last Union" by Allison Kilkenny at Truthout.org.
This doesn't have to happen. There is legislation pending which would prevent bankruptcy and pay the debt. The only reason any Demolicans or Republicrats would oppose it is because they're azz-sucking servants of the overtly fascist corporatocracy.
The Post Office is the second-biggest employer in the US, and it's employees are the biggest union. 99% Take notice: this would be a natural place to take a stand. Occupy the post office.