Despite Hillary with approximately at 60/30 advantage in Iowa in polling, there is FAR more of a ground swell of support for Crazy Uncle Bernie here. Remember, she wants to be coronated, and not have to campaign, especially at farms & small towns in Iowa. She thinks it is beneath her.
I suspect that Sanders has still a slight possibility of winning Iowa. Since New Hampshire is essentially in his backyard, he could certainly win there. Then the media narrative would change to "what's wrong with Hillary?". That would be kind of fun.