The folks at the DLC write:

Demands for an immediate troop withdrawal or arbitrary deadlines risk turning premature declarations that the United States has failed in Iraq into a self-fulfilling prophecy. That is why Democrats must reject them. If our forces leave before the Iraqis can defend themselves, the result will be a national security disaster for the United States. Iraq will be convulsed into full-scale civil war that could provoke a regional conflagration. The Sunni triangle will likely become home base for the global jihad network, a safe haven for hatching new terrorist plots against our country and our friends. America will once again have broken faith with Iraq's long-suffering Kurds and Shi'a, and the cause of Arab democracy will be set back for a generation.

The DLC's remarks come on the heels of those made by the House Minority Whip Steny Hoyer. From Hoyer press statement on the President's Iraq speech, November 30, 2005:

I believe that a precipitous withdrawal of American forces in Iraq could lead to disaster, spawning a civil war, fostering a haven for terrorists and damaging our nation's security and credibility.