Shoot a president? Count me in... wait, I have no options?
The point of the tech-demo-thingy is to recreate what allegedly happened in Dallas, and that's it. The real fun to be had is shooting everything/everyone else, but it gets old quickly.
I know it's supposed to be a "educational" tool, or something, but this tech-demo-thingy would have been way better if you could change things around; like shoot from a different window (or from the grassy knoll), use different weapons, change the cars in the motorcade, put more alert guards, etc.
Hell, even give the option to shoot other presidents, like Lincoln, Garfield, McKinley, Reagan at the place where they were shot. It'd make this more interesting, be more "educational," and would cause more controversy.