Does race in movies and on TV matter to young kids?

There's been a lot of hype around Disney's debut of its first black princess in the movie "The Princess and the Frog." But some say that in the era of Sasha and Malia Obama, the historic nature of Tiana doesn't register with little kids. Do you think seeing characters like Tiana has an impact on children? Do your children see a diversity of characters on TV and in movies?