Postal Service Reports $2 Billion Quarterly Loss as Cash Crunch Mounts

(Adds comment from USPS, details and background on USPS, paragraphs 2 and 4-9)By David ShepardsonWASHINGTON, May 8 (Reuters) – The U.S. Postal Service on Friday reported a net quarterly loss of $2 billion as it faces a growing financial crisis and has warned it could run…