I think the foreign policy debate is the most dangerous for obama.
Mexico
--obama's justice department allowed over 2500 assault rifles to be transferred to drug cartels resulting in the death of over 300 mexican citizens, men, women and children, and "operation Castaway," another guns for cartels program transferred guns to Countries in Central and South AMerica as well, with more murders and mayhem stemming from these sales. Also, there was another gun running program in Texas.
Canada
--Denial of the Keystone pipeline from Canada killed jobs here, increases our dependence on oil from radical muslim countries, and is forcing our friend and ally Canada to ship that oil to China, one of our main competitors and lenders.
Russia
--The scene where Obama tells Russian President Medvedev "Tell putin I need more space because I'll have more room after the election," was a chilling thing to see an American president do. Russia is acting aggressively and obama isn't doing anything but coddle them, surrendering to their demands on nuclear disarmament and the missle shield, which makes our new friends, the former soviet satellite nations, like Poland, extremely nervous about our committment to them.
Middle East
--Our embassies are under attack, our Ambasodor and several others murdered and it may very well turn out that on the anniversary of 9/11, in a radialized Muslim country that just changed governments in a violent revolution, pleas for more security from the Ambasodor on the ground were ignored, and during the attack obama hesitated to send in support.
--by attacking oil, coal and natural gas, obama makes us more dependent on the oil from radical islamic countries. No matter how much some may wish it, solar and wind will not solve any of our energy problems for another 50-100 years, if then.
Iran
--obama has made it clear to the world that a nuclear armed Iran is not that big of a problem, regardless of what he actually says. Rational people see this as a major problem.
Israel
--He keeps insulting our best allies in the middle east, and ignores their fears about Iran.
Our Military
--In a dangerous world, obama embraces drastic cuts to our military. Even with the wars in Iraq and Afganistan being prematurely ended by obama, cutting our military, 20,000 marines, 80,000 army personel, and cuts to the airforce and navy hurt our ability to project strength around the world.
Bin laden
--yeah, obama gave the order, but the only thing that allowed him to "give the order," was all the Bush policies and decisions that allowed us to actually find out where bin laden was, and to be in a position to get at him.
Afganistan
--This is the war obama supported...we just reached 2000 combat deaths of American service personel, the surge is deemed a failure and "green on blue" attacks are now the preferred method of attack by the Taliban and al queda. The commander on the ground asked for 80,000 troops to make the surge work. Obama asked him how few troops could he get the job done with, the commander said 40,000, so obama gave him 35,000 and and announced the date we were pulling out.
So, no, foreign policy is going to be as rough if not rougher for obama in the next debate.