Caption contest: What were they seeing or what were they saying?

Ace found a marvelous picture from today’s ceremony for the opening of the George W. Bush Presidential Library.  His post caption is perfect:  “I Don’t Know The Backstory and I’m Content Not To.”

I agree with him, but I also think I picture like this demands a caption.  What were they looking at?  What did they just hear?  What are they saying?  You all are some of the wittiest people I know.  I just have to open this one up to you.