Barack Obama and John McCain

Presidential candidates John McCain and Barack Obama debated in Nashville, Tennessee, on Tuesday night. Tom Brokaw moderated the debate. Here is an excerpt from the transcript of that debate.

BROKAW: Sen. Obama, let me ask you if -- let's see if we can establish tonight the Obama doctrine and the McCain doctrine for the use of United States combat forces in situations where there's a humanitarian crisis, but it does not affect our national security.

Take the Congo, where 4.5 million people have died since 1998, or take Rwanda in the earlier dreadful days, or Somalia.

What is the Obama doctrine for use of force that the United States would send when we don't have national security issues at stake?

OBAMA: Well, we may not always have national security issues at stake, but we have moral issues at stake.

If we could have intervened effectively in the Holocaust, who among us would say that we had a moral obligation not to go in?

If we could've stopped Rwanda, surely, if we had the ability, that would be something that we would have to strongly consider and act.

So when genocide is happening, when ethnic cleansing is happening somewhere around the world and we stand idly by, that diminishes us.

And so I do believe that we have to consider it as part of our interests, our national interests, in intervening where possible.

But understand that there's a lot of cruelty around the world. We're not going to be able to be everywhere all the time. That's why it's so important for us to be able to work in concert with our allies.

Let's take the example of Darfur just for a moment. Right now there's a peacekeeping force that has been set up and we have African Union troops in Darfur to stop a genocide that has killed hundreds of thousands of people.

We could be providing logistical support, setting up a no-fly zone at relatively little cost to us, but we can only do it if we can help mobilize the international community and lead. And that's what I intend to do when I'm president.

BROKAW: Sen. McCain, the McCain Doctrine, if you will.

MCCAIN: Well, let me just follow up, my friends. If we had done what Sen. Obama wanted done in Iraq, and that was set a date for withdrawal, which Gen. [David] Petraeus, our chief -- chairman of our Joint Chiefs of Staff said would be a very dangerous course to take for America, then we would have had a wider war, we would have been back, Iranian influence would have increased, al Qaeda would have re- established a base.

There was a lot at stake there, my friends. And I can tell you right now that Sen. Obama would have brought our troops home in defeat. I'll bring them home with victory and with honor and that is a fundamental difference.

The United States of America, Tom, is the greatest force for good, as I said. And we must do whatever we can to prevent genocide, whatever we can to prevent these terrible calamities that we have said never again.

But it also has to be tempered with our ability to beneficially affect the situation. That requires a cool hand at the tiller. This requires a person who understands what our -- the limits of our capability are.

We went in to Somalia as a peacemaking organization, we ended up trying to be -- excuse me, as a peacekeeping organization, we ended up trying to be peacemakers and we ended up having to withdraw in humiliation.

In Lebanon, I stood up to President Reagan, my hero, and said, if we send Marines in there, how can we possibly beneficially affect this situation? And said we shouldn't. Unfortunately, almost 300 brave young Marines were killed.

So you have to temper your decisions with the ability to beneficially affect the situation and realize you're sending America's most precious asset, American blood, into harm's way. And, again, I know those situations.

I've been in them all my life. And I can tell you right now the security of your young men and women who are serving in the military are my first priority right after our nation's security.

And I may have to make those tough decisions. But I won't take them lightly. And I understand that we have to say never again to a Holocaust and never again to Rwanda. But we had also better be darn sure we don't leave and make the situation worse, thereby exacerbating our reputation and our ability to address crises in other parts of the world.