"With language in the appropriation bill for over 30 years, the consensus is that the Postal Service must deliver mail on Saturdays, " Ms. Goldway said.

WSJ: Saturday Postal Pullback in Limbo

Of course, the main front there is the resolution or rather the supplemental appropriation bill that both the House and Senate have passed that includes a timetable, a timetable for getting out of Iraq, and a timetable that's pretty popular with the American people.

NPR: Political Roundup: Pelosi in Syria, Iraq Debate

He said the Postal Service began to question whether it even technically fell under Congress's appropriation bill, because the service is an independent agency that doesn't receive an annual taxpayer subsidy, but instead is reimbursed by Congress for certain relatively small areas, including delivering mail to the blind and overseas voters.

WSJ: U.S. Postal Service to Cut Saturday Mail