That is the same reason all those "man on the street" segments on "The Tonight Show" which make Americans look dumb as posts are suspect. You have to wonder how many people give the correct answer to the question of the day before a nitwit comes along. Edit a bunch of nitwits together who don't know who is buried in Grant's Tomb or who George Washington was, and voila! "Proof" that Americans are ignorant.
I don't know about that. Hannity's man on the street interviews seem pretty straight-forward, and the people are monumentally ill-informed.