marn" will do for education what an "an inconvenient truth" did nor climate change. it opens today, and we want to take a look at what it means and the debate it's creating. kareen wynter has more. >> you think most people are getting a crappy education right now? >> i don't think they are. i know they are. >> reporter: davis guggenheim has a message for america. >> if we don't fix our public schools, we're in trouble. >> reporter: he knows how to get his message across. his last film earned $50 million at the box office, and if lightning strikes twice, his new film "waiting for super marn" would do the same thing for public education. cnn caught up with guggenheim at the sun dance film festival. >> the system we built works really well for the adults, like