Katy Perry and Orlando Bloom have urged the American public to stand up for their right to vote in a shocking campaign video.The clip, which was released on 17 June, begins by telling viewers it's the year 2055 before changing the scene to the couple appearing to be trapped in a bunker in a post-apocalyptic world where "democracy is dead".The pair, who are currently enjoying a romantic trip in Venice with their daughter Daisy Dove, are seen flicking switches on a control panel before standing in