If anything, this debate was a tie, which benefits Obama much more than McCain. McCain came off as a jerk, while Obama was cool personified.* More than that, Obama showed he's well-versed in foreign policy, and that an Obama Presidency would not be a risky proposition. Now all Obama has to do is point out - matter of factly - that a President McCain would be dangerous, driven by a "beautiful fatalism" that would lead to another Cold War, which is what McCain appears most comfortable with.
Today, more than ever, I feel confident that Obama will win this election.
* Alas, the original Mr Cool passed away this morning. Paul Newman, RIP. Your "Newman's Own Virgin Lemonade" is a staple.