Well, this is a silly poll. They're asking about apples and oranges. People grew up hearing about Snow White and her little dwarves. Harry Potter has how many movies out now? Pollsters are trying to compare something that is out there in front of people, day after day, to something else they only hear about on the news, if then.
Plus, Snow White and Harry Potter are fictional and static, Supreme Court Justices and Prime Ministers are fluid, thank God.
Maybe if the justices and political figures were bedtime stories and blockbuster movies more people would know about them.
.........agreed, up to a point, though..... can we as a people be so broadly ignorant that we cannot even identify the three branches of our government...? I'm greatly
paraphrasing a famous Virginian, Thomas Jefferson, who philosophy would most certainly have been comfortable with the thought that an ignorant people could not long remain free.....