Live Q&As

The idea is to present a comprehensive picture of the road President Obama walked over the last 18 months. In the course of reporting, I did get McChrystal's assessment --- this was a year ago, and we published it in the Post because it was newsworthy at the time. I try to keep in touch with the editors at the Washington Post so we, together, can assess whether something should go in the paper immediately. Of course, that requires getting a source's approval, as was the case with the source on the McChrystal report.

Secretary of Defense Gates obviously plays a key role. And President Obama used a Gates memo and a comment Gates made at one of the strategy reviews to devise his own personal strategy, namely the addition of 30,000 more troops with the beginning of some kind of withdrawal in July 2011. Significantly, Gates is heading for the exit and clearly wants to leave. He initially agreed to stay for one year because he was a hold-over from the Bush administration. Obama got a second year out of him, but as the book reports, the president would have liked Gates to stay for the whole term - another two years.

As General Petraeus told Obama last year, the military is not self-employed. And in fact, everyone in the chain of command understands the president as commander in chief is the boss. At the same time, the reporting for this book conclusively shows that the military worked day and night to try to get 40,000 more troops and a more expansive protect-the-population counterinsurgency strategy.  There's a legitimate debate whether the military won this contest.

Secretary Clinton is very much present in the book and is a strong supporter of the military. If you read what she said at the strategy review sessions, at times she sounds more hawkish than Secretary of Defense Gates or the uniformed military leaders.

Of course, I cannot answer that. Protecting sources is a long tradition in journalism and at the Washington Post. The public surfacing of the 66-page McChrystal report allowed the public to see what was happening and what the stakes were. People in the White House later told me that the public discussion of the report helped everyone understand what McChrystal was really saying, namely, more troops or we fail. Transparency worked.

General Petraeus has been able to establish a working relationship with President Karzai. But as the book points out, Karzai -- according to intelligence reports -- is a manic depressive and he's not always taking his medication. He is an erratic and unreliable partner much of the time. And the debate continues in the Obama administration to this day: how do we find the leverage to get more help from Karzai?

That's an excellent question. When you spend 18 months trying to understand Obamaland, you realize how truly difficult it is to be president. In these times of economic stress, great uncertainty in the world, the threat of terrorism and two wars, historians may look back and realize it's too much for one person.

President Obama is acutely aware of declining public support, and at one early meeting speculates that he has about two years to get the war straightened out and on a steady, clear course. General Petraeus, the current commander in Afghanistan, believes that if he shows some kind of measurable progress in the war, he will get more time on the clock to continue with his mission.

At this point, it's clear the United States is not just going to pull out of Afghanistan. The question is how - under the current strategy - the momentum can shift, because the Taliban insurgency apparently still has the upper hand.

The best reason is that my approach is neutral inquiry, not partisan or ideological. The sources know this is the most serious contemporary account that will come out about the deliberations and the struggle over Afghanistan during Obama's four-year term. I try to give everyone their say. I don't think there's a downside for somebody who is willing to have an unvarnished version of events appear in a book.

President Obama avoids the use of words like victory and winning in public. I think intellectually he understands, as he's said a number of times, he'd been dealt a bad hand in this war. And I would not be surprised at some point down the road to hear the old Vietnam term surface : 'Peace with honor'.

As President Obama said, "The cancer is in Pakistan". It is a fragile civilian government with serious economic problems. Pakistan is now dealing with a catastrophic flood. As a number of advisers and intelligence experts told the president, Pakistan may be the most dangerous country in the world. Obama and his national security team are trying to find a way to leverage or coerce the Pakistanis to be more cooperative in the war on the al Qaeda and Taliban safe havens in Pakistan. Two days after Obama was elected president in 2008, the intelligence experts told him Pakistan is "living a lie". The country fights some terrorists and supports others.

The eventual departure of these key players just underscores how unsettled the war effort now is. It will be very important to see what kind of people with what kind of experience come into these critical posts.

As we have learned, anything can happen in American politics. I report that some of Hillary Clinton's advisers have speculated on this possibility, but it will depend on the political conditions for Obama in early 2012.

There is no fixed date that I know of, but it becomes crystal clear that President Obama wants out of Afghanistan and he repeatedly told his advisers the plan had to focus on how to turn over the war to the Afghan security force and get out. "There can be no wiggle room," he said at one point.

Eliot Cohen tries to enter the heads of some of the people around the world and speculate on how they might look at the book. At least one of them, I thought, was very good - this was the case where he wonders what the father of a lance corporal in Afghanistan might think about all the jockeying and uncertainty in Washington.

Going back to Nixon, it is evident that the power of the presidency is growing and growing. For example, Obama discovered he's not commander in chief of the economy, but many people expect him to be. I focused on his role as commander in chief because he has almost total authority on making these decisions. If in theory he wanted to send the entire U.S. military to Afghanistan, or withdraw all the forces as soon as possible, he could do so.  I also found that he is acutely aware of this authority and responsibility.

Thanks for all your questions! I wish I had more time.