It is time for the United States to leave Iraq, without any more delay than the Pentagon needs to organize an orderly exit.

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Like many Americans, we have put off that conclusion, waiting for a sign that President Bush was seriously trying to dig the United States out of the disaster he created by invading Iraq without sufficient cause, in the face of global opposition, and without a plan to stabilize the country afterward.

At first, we believed that after destroying Iraq’s government, army, police and economic structures, the United States was obliged to try to accomplish some of the goals Mr. Bush claimed to be pursuing, chiefly building a stable, unified Iraq. When it became clear that the president had neither the vision nor the means to do that, we argued against setting a withdrawal date while there was still some chance to mitigate the chaos that would most likely follow.

While Mr. Bush scorns deadlines, he kept promising breakthroughs — after elections, after a constitution, after sending in thousands more troops. But those milestones came and went without any progress toward a stable, democratic Iraq or a path for withdrawal. It is frighteningly clear that Mr. Bush’s plan is to stay the course as long as he is president and dump the mess on his successor. Whatever his cause was, it is lost.