This is why Obama brings a teleprompter with him everywhere he speaks, even at a rodeo. If he doesn’t have the words scrolling in front of him, he collapses:
Wow, that’s really hard to watch. He didn’t even familiarize himself with the content of the speech; instead, it appeared he went into it blind, assuming the speech would be there for him. He was, as pilots say, flying like his engine would never quit.