I just heard the town hall a minute ago, and I think we almost missed Bill Richardson's most important point: Bill Richardson also stated, in the last town hall - that there is an easy and straightforward way to stop the war. This is profound - it is a very powerful expression of the power of congress.

Bill Richardson has proposed that the War Powers Act allows congress to pass a de-authorization of the War in Iraq.
Congress can do this.

If this goes on the table now, especially with the democrats unified on the move - it will send a clear signal to the white house that the democrats are serious regarding the counter to the veto threat. This wouldn't be playing chicken with the troops - this would be regaining the constitutional authority of congress to authorize and declare war.