BROKAW: Sen. Obama, the economic constraints on the U.S. military action around the world.

OBAMA: Well, you know, Sen. McCain, in the last debate and today, again, suggested that I don't understand. It's true. There are some things I don't understand.

I don't understand how we ended up invading a country that had nothing to do with 9/11, while Osama Bin Laden and Al Qaeda are setting up base camps and safe havens to train terrorists to attack us.

That was Sen. McCain's judgment and it was the wrong judgment.

When Sen. McCain was cheerleading the president to go into Iraq, he suggested it was going to be quick and easy, we'd be greeted as liberators.

That was the wrong judgment, and it's been costly to us.

So one of the difficulties with Iraq is that it has put an enormous strain, first of all, on our troops, obviously, and they have performed heroically and honorably and we owe them an extraordinary debt of gratitude.

But it's also put an enormous strain on our budget. We've spent, so far, close to $700 billion and if we continue on the path that we're on, as Sen. McCain is suggesting, it's going to go well over $1 trillion.

We're spending $10 billion a month in Iraq at a time when the Iraqis have a $79 billion surplus, $79 billion.

And we need that $10 billion a month here in the United States to put people back to work, to do all these wonderful things that Sen. McCain suggested we should be doing, but has not yet explained how he would pay for.

Now, Sen. McCain and I do agree, this is the greatest nation on earth. We are a force of good in the world. But there has never been a nation in the history of the world that saw its economy decline and maintained its military superiority.

And the strains that have been placed on our alliances around the world and the respect that's been diminished over the last eight years has constrained us being able to act on something like the genocide in Darfur, because we don't have the resources or the allies to do everything that we should be doing.

That's going to change when I'm president, but we can't change it unless we fundamentally change Sen. McCain's and George Bush's foreign policy. It has not worked for America.

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.

Here's the relevant portion of the debate transcript:

IFILL: Senator, you have quite a record, this is the next question here, of being an interventionist. You argued for intervention in Bosnia and Kosovo, initially in Iraq and Pakistan and now in Darfur, putting U.S. troops on the ground. Boots on the ground. Is this something the American public has the stomach for?

BIDEN: I think the American public has the stomach for success. My recommendations on Bosnia. I admit I was the first one to recommend it. They saved tens of thousands of lives. And initially John McCain opposed it along with a lot of other people. But the end result was it worked. Look what we did in Bosnia. We took Serbs, Croats and Bosniaks, being told by everyone, I was told by everyone that this would mean that they had been killing each other for a thousand years, it would never work.

There's a relatively stable government there now as in Kosovo. With regard to Iraq, I indicated it would be a mistake to -- I gave the president the power. I voted for the power because he said he needed it not to go to war but to keep the United States, the UN in line, to keep sanctions on Iraq and not let them be lifted.

I, along with Dick Lugar, before we went to war, said if we were to go to war without our allies, without the kind of support we need, we'd be there for a decade and it'd cost us tens of billions of dollars. John McCain said, no, it was going to be OK.

I don't have the stomach for genocide when it comes to Darfur. We can now impose a no-fly zone. It's within our capacity. We can lead NATO if we're willing to take a hard stand. We can, I've been in those camps in Chad. I've seen the suffering, thousands and tens of thousands have died and are dying. We should rally the world to act and demonstrate it by our own movement to provide the helicopters to get the 21,000 forces of the African Union in there now to stop this genocide.

IFILL: Thank you, senator. Governor.

PALIN: Oh, yeah, it's so obvious I'm a Washington outsider. And someone just not used to the way you guys operate. Because here you voted for the war and now you oppose the war. You're one who says, as so many politicians do, I was for it before I was against it or vice- versa. Americans are craving that straight talk and just want to know, hey, if you voted for it, tell us why you voted for it and it was a war resolution.

And you had supported John McCain's military strategies pretty adamantly until this race and you had opposed very adamantly Barack Obama's military strategy, including cutting off funding for the troops that attempt all through the primary.

And I watched those debates, so I remember what those were all about.

But as for as Darfur, we can agree on that also, the supported of the no-fly zone, making sure that all options are on the table there also.

America is in a position to help. What I've done in my position to help, as the governor of a state that's pretty rich in natural resources, we have a $40 billion investment fund, a savings fund called the Alaska Permanent Fund.

When I and others in the legislature found out we had some millions of dollars in Sudan, we called for divestment through legislation of those dollars to make sure we weren't doing anything that would be seen as condoning the activities there in Darfur. That legislation hasn't passed yet but it needs to because all of us, as individuals, and as humanitarians and as elected officials should do all we can to end those atrocities in that region of the world.

Recently, Senators Obama and McCain took a very positive step and completed a detailed questionaire on their Darfur views which was submitted by Ask the Candidates.org. You can read their answers here:

http://www.askthecandidates.org/files/Obama_McCain_questionnaire.pdf

This is a good start. Now they need to start talking on the stump about their positions on Darfur and updating their views to reflect current events as the crisis evolves.

See the blog post about our page here:

http://www.ourpledge.org/mccain-and-obama-tell-voters-your-darfur-plan