a modern-day Paul Revere

Someone who embarks on a long and arduous journey or mission in order to deliver an especially important message. (Paul Revere was a Patriot in the American Revolution famous for his "midnight ride" to warn other patriots as to the movement of British troops.) The media personality claims to be a modern-day Paul Revere, warning people not of the British, but of the actions and agendas of political extremists within our own population. Look, you don't need to be a modern-day Paul Revere—let people evaluate the candidates on their own and make up their own minds. Larry thinks he's a modern-day Paul Revere, constantly warning all of us about climate change and global warming, but who wants to hear about that stuff non-stop? He just ends up being a downer.