Some will say moving toward strong regionalism would ignite sectarian cleansing. But that's exactly what is going on already, in ever-bigger waves. Others will argue that it would lead to partition. But a breakup is already under way. As it was in Bosnia, a strong federal system is a viable means to prevent both perils in Iraq.

The second element would be to entice the Sunnis into joining the federal system with an offer they couldn't refuse. To begin with, running their own region should be far preferable to the alternatives: being dominated by Kurds and Shiites in a central government or being the main victims of a civil war. But they also have to be given money to make their oil-poor region viable. The Constitution must be amended to guarantee Sunni areas 20 percent (approximately their proportion of the population) of all revenues.

The third component would be to ensure the protection of the rights of women and ethno-religious minorities by increasing American aid to Iraq but tying it to respect for those rights. Such protections will be difficult, especially in the Shiite-controlled south, but Washington has to be clear that widespread violations will stop the cash flow.

Fourth, the president must direct the military to design a plan for withdrawing and redeploying our troops from Iraq by 2008 (while providing for a small but effective residual force to combat terrorists and keep the neighbors honest). We must avoid a precipitous withdrawal that would lead to a national meltdown , but we also can't have a substantial long-term American military presence. That would do terrible damage to our armed forces, break American and Iraqi public support for the mission and leave Iraqis without any incentive to shape up.

Fifth, under an international or United Nations umbrella, we should convene a regional conference to pledge respect for Iraq's borders and its federal system. For all that Iraq's neighbors might gain by picking at its pieces, each faces the greater danger of a regional war. A "contact group" of major powers would be set up to lean on neighbors to comply with the deal.

Mr. Bush has spent three years in a futile effort to establish a strong central government in Baghdad, leaving us without a real political settlement, with a deteriorating security situation — and with nothing but the most difficult policy choices. The five-point alternative plan offers a plausible path to that core political settlement among Iraqis, along with the economic, military and diplomatic levers to make the political solution work. It is also a plausible way for Democrats and Republicans alike to protect our basic security interests and honor our country's sacrifices.