How can I get local television programs over the internet?

I know about streaming TV programs on sites like Hulu, but this is mainly entertainment programming - not news programming. Does anyone know of a site that aggregates ALL local programming? I know I can go to separate outlet sites like CNN or NBC, but what if I just want to watch the internet as if it were regular TV? Does this even exist? It doesn't have to be a free site. It just has to be reliable (preferably legal).