Scott Kelby did a piece on the same topic a few months ago. Here is the link to his article. He hit the nail on the head. Turns out Thomas Jefferson, one of our founding fathers, did exactly the same thing - he refused to read the newspapers of the time because of all the negative news.
So how can this way of thinking affect our finances? Check out this article over at nonstarvingartists.com right here. It's a different way to think about your success. Give it a read, things might start looking quite rosy for you.