Joe Klein got the same memo days ago:
The powerful bazaari community has been shocked not just by the universal support for the sanctions, but also by their comprehensive nature. Iranian ships are sitting at their docks because they international community is refusing to insure them. Banks that have done business with Iran in the past are refusing to do so now because the UN sanctions--that's right, those "weak" UN sanctions--target them as well. The Iranian economy, a stagflation fiasco before the sanctions, is cracking.
As a result, the Administration has been receiving all sorts of feelers--public and, for the first time, private--from the Iranians about resuming the negotiations on the nuclear program.