Getting the opportunity to portray a Us President in film is rare. It can be a dignified role, and many times the actor has to be able to exhibit certain qualities we would traditionally associate with the Us head of state. Us Presidents are also depicted in film in a variety of ways. Some of them are the main characters for their respective films, where others are simply bit parts designed to represent the figurehead. Other roles may be satires, caricatures, or played for comedic effect. Regardless of the purpose or the depth of the role, there have been a limited number of Us President roles in the last century+ of motion picture projection.
Of course, some actors are more Presidential than others.