I think I've seen this debated elsewhere and Obama has had a reason why he does not put his hand over his heart etc. I wish I could remember where I read the reasoning behind it.
Here's a link to the snopes article on it. I think it gives out some explanations. Thanks for sharing the video. I hadn't seen it yet.
I do think that after hearing his first debate he sounds more for the American people than I previously thought. Hopefully it was sincere.