Sen. Hillary Clinton declared this weekend, " I'm in to win." Anyone who has watched her remarkable trajectory can have no doubt that she'll do whatever it takes to win the presidency. I wish she felt the same way about the war.

In fairness, Clinton, with her proposal for arbitrary caps on troop levels and hemming and hawing about her vote for the war resolution, has company on both sides of the aisle. Sen. Joseph Lieberman is the only national Democrat showing any courage on this issue. We Republicans -- with help from senators such as Chuck Hagel -- seem ready to race the Democrats to the bottom.

I'd like to ask the politicians in both parties who are heading for the hills to stop and reflect on these basic facts:

· We are at war. America faces an existential threat. This is not, as Speaker Nancy Pelosi has claimed, a "situation to be solved." It would be nice if we could wake up tomorrow and say, as Sen. Barack Obama suggested at a Jan. 11 hearing, "Enough is enough." Wishing doesn't make it so. We will have to fight these terrorists to the death somewhere, sometime. We can't negotiate with them or "solve" their jihad. If we quit in Iraq now, we must get ready for a harder, longer, more deadly struggle later.

· Quitting helps the terrorists. Few politicians want to be known as spokesmen for retreat. Instead we hear such words as "redeployment," "drawdown" or "troop cap." Let's be clear: If we restrict the ability of our troops to fight and win this war, we help the terrorists. Don't take my word for it. Read the plans of Abu Musab al-Zarqawi and Ayman Zawahiri to drive America from Iraq, establish a base for al-Qaeda and spread jihad across the Middle East. The terrorists are counting on us to lose our will and retreat under pressure. We're in danger of proving them right.

· Beware the polls. In November the American people expressed serious concerns about Iraq (and about Republican corruption and scandals). They did not say that they want us to lose this war. They did not say that they want us to allow Iraq to become a base for al-Qaeda to conduct global terrorist operations. They did not say that they would rather we fight the terrorists here at home. Until you see a poll that asks those questions, don't use election results as an excuse to retreat.

· Retreat from Iraq hurts us in the broader war. We are fighting the war on terrorism with allies across the globe, leaders such as Hamid Karzai in Afghanistan and Pervez Musharraf in Pakistan. Brave activists are also standing with us, fighting for freedom of speech, freedom of religion, the empowerment of women. They risk their lives every day to defeat the forces of terrorism. They can't win without us, and many of them won't continue to fight if they believe we're abandoning them. Politicians urging America to quit in Iraq should explain how we win the war on terrorism once we've scared all of our allies away.

What about Iran? There is no doubt that an American retreat from Iraq will embolden Mahmoud Ahmadinejad, making it even less likely that the Iranian president will bend to the will of the international community and halt his nuclear weapons program.

A member of Lebanon's parliament recently told me that Lebanese Sunnis, Shiites and Christians are lining up with Iran and Syria to fight against Sunnis, Shiites and Christians who want to stand with America. When I asked him why people were lining up with Iran and Syria, he said, "Because they know Iran and Syria aren't going anyplace. We're not so sure about America."

· Our soldiers will win if we let them. Read their blogs. Talk to them. They know that free people must fight to defend their freedom. No force on Earth -- especially not an army of terrorists and insurgents -- can defeat our soldiers militarily. American troops will win if we show even one-tenth the courage here at home that they show every day on the battlefield. And by the way, you cannot wish failure on our soldiers' mission and claim, at the same time, to be supporting the troops. It just doesn't compute.

I suppose Hillary Clinton's announcement was a sign of progress. In 2007, a woman can run for president and show the same level of courage and conviction about this war many of her male colleagues have. Steel in the spine? Not so much.

America deserves better. It's time for everyone -- Republicans and Democrats -- to stop trying to find ways for America to quit. Victory is the only option. We must have the fortitude and the courage to do what it takes. In the words of Winston Churchill, we must deserve victory.

We must be in it to win.

The writer is former principal deputy assistant secretary of state for Near Eastern affairs.