Who won? Depends on what you think about the American voter/viewer.

If you think that Joe six-pack knows jack shit about wonky policy and votes based on who looks and sounds like a Hollywood movie version of a president then Romney won.

If you know some policy stuff you think Romney was full of sound bite BS but Obama was not confrontational and somewhat right on policy but also embracing centrist pro Republican policies, etc. and Obama did not lose but he did not bury Romney.

What I think? I tend to think Americans respond to gotcha moments - I am a cynic - and I saw no gotcha moments that can be looped over and over against either candidate.