we are thankful that youins us to talk about it. >> coming up culture, language and culture. to the navaho nation where an election is shining the spotlight on a disappearing culture. >> and the story of the last person to finish the boston marathon. marathon. >>> we have a winner in the presidential election for the largest native tribe. it was a race postponed for five fronts after a leading candidate was struck as he was not fluent in the native language. this report from the navaho nation in the south-west on a controversy that divided the community. >> the navaho faced questions about its heritage future brought bon by an election. >> i voted for chris and then - i don't know what happened. they got him off the ballot. >> the rising political star was disqualified. why? >> it was not fluent in navaho. >> language is important, identifying who we are, where we came from. you kept be a nation without language. it upended the process and exposed deep divisions about what it means. >> anyone wanting to be president and vice president needs to take time to learn the rang wing