And thus is revealed the other reason they come out to Hollywood so often. First of course, to raise money. Second, to learn the tricks of the trade. Rolled up shirt sleeves like he's ready to go to work and camera angles that hide the 4th wall. It truly is something to see the images in the linked article. There seem to be more people standing behind him than in front of him.
The only thing that would make it more cinematic is if they put up a giant screen broadcasting his speech inside the arena.