Also, one more thing we noticed. There was a camera man following along with the president and also during the speech taking pictures of the crowd. We theorized this was so they could study them to see if maybe the same people were showing up to different venues, like stalking or something. I'd say it's a good bet your theory is correct. I've heard from a family who has a son-in-law SS that an unbelievable amount of prep work takes place for each and every appearance the President makes. IMO, they just can't be paid enough for the job they do.