Prime Minister Nouri al-Maliki's move appeared to disregard the wishes of the U.S. government, which has quietly lobbied against the plebiscite. American officials fear it could lead to the annulment of an agreement allowing U.S. troops to stay until the end of 2011, and instead force them out by the start of that year.

The Maliki government's announcement came on the day that the top U.S. general in Iraq proposed a plan to deploy troops to disputed areas in the restive north, a clear indication that the military sees a continuing need for U.S. forces even if Iraqis no longer want them here.
Interesting, I have a feeling that even if the Iraqis ask us to leave via a vote, the hawks that surround Obama wont let him.