“Why does Obama ALWAYS look to the side, he hardly never looks straight ahead?”
To keep people from seeing into his soul.
As a witty and observant FReeper recently said (whose handle I can't remember); "It's like watching someone who is watching a tennis match. It's really annoying." I concur.
As to why? I think his mother used to say "Barack Hussein! look me in the eye and tell me you're telling the truth!!!"