What do you do when there's a national emergency, like say, oh I don't know, a terrorist attack on American soldiers, and you're the Commander In Chief? How about tacking on some comments about the mass murder after your opening spiel and after you give a "shout-out".
Classy. And better yet, what if Bush had done the same thing? But in fairness to Obama, it's really hard to reprogram a teleprompter.