But just as politics are a bad motive for choosing a war, so they can be a doomed engine for running a war. In an interview with Tim Russert early last year, Mr. Bush said, "The thing about the Vietnam War that troubles me, as I look back, was it was a political war," adding that the "essential" lesson he learned from Vietnam was to not have "politicians making military decisions." But by then Mr. Bush had disastrously ignored that very lesson; he had let Mr. Rumsfeld publicly rebuke the Army's chief of staff, Eric Shinseki, after the general dared tell the truth: that several hundred thousand troops would be required to secure Iraq. To this day it's our failure to provide that security that has turned the country into the terrorist haven it hadn't been before 9/11 -- "the central front in the war on terror," as Mr. Bush keeps reminding us, as if that might make us forget he's the one who recklessly created it.

The endgame for American involvement in Iraq will be of a piece with the rest of this sorry history. "It makes no sense for the commander in chief to put out a timetable" for withdrawal, Mr. Bush declared on the same day that 14 of those Ohio troops were killed by a roadside bomb in Haditha. But even as he spoke, the war's actual commander, Gen. George Casey, had already publicly set a timetable for "some fairly substantial reductions" to start next spring. Officially this calendar is tied to the next round of Iraqi elections, but it's quite another election this administration has in mind. The priority now is less to save Jessica Lynch (or Iraqi democracy) than to save Rick Santorum and every other endangered Republican facing voters in November 2006.

Nothing that happens on the ground in Iraq can turn around the fate of this war in America: not a shotgun constitution rushed to meet an arbitrary deadline, not another Iraqi election, not higher terrorist body counts, not another battle for Falluja (where insurgents may again regroup, The Los Angeles Times reported last week). A citizenry that was asked to accept tax cuts, not sacrifice, at the war's inception is hardly in the mood to start sacrificing now. There will be neither the volunteers nor the money required to field thewholesale additional American troops that might bolster the security situation in Iraq.

WHAT lies ahead now in Iraq instead is not victory, which Mr. Bush has never clearly defined anyway, but an exit (or triage) strategy that may echo Johnson's March 1968 plan for retreat from Vietnam: some kind of negotiations (in this case, with Sunni elements of the insurgency), followed by more inflated claims about the readiness of the local troops-in-training, whom we'll then throw to the wolves. Such an outcome may lead to even greater disaster, but this administration long ago squandered the credibility needed to make the difficult case that more human and financial resources might prevent Iraq from continuing its descent into civil war and its devolution into jihad central.

Thus the president's claim on Thursday that "no decision has been made yet" about withdrawing troops from Iraq can be taken exactly as seriously as the vice president's preceding fantasy that the insurgency is in its "last throes." The country has already made the decision for Mr. Bush. We're outta there. Now comes the hard task of identifying the leaders who can pick up the pieces of the fiasco that has made us more vulnerable, not less, to the terrorists who struck us four years ago next month.