this should clear it up, and it's true, Lance isn't sponsored by the USPS any longer.
"The tax payers don't own the United States Postal Service as Mr. Dembart states. It is true that we were mandated to operate as a business and it is true that we are a wholly owned subsidiary of the United States federal government. By 1981, our operations were no longer funded by tax payer dollars and we began self-supporting the organization through the sale of stamps and stamp-related products."
http://www.usps.com/news/fyi/intlherald_response.htm