Also, Bill O'Reilly had an interesting insight. He said that Obama is accustomed to all the people around him agreeing with him and liking everything he does. As a result, he has a thin skin. In this respect, as well as in many others, he is the opposite of Bush. Whatever you may think about either Bush I or Bush II, they were always consummate professionals, even when they were unfairly criticized. They seemed to know that criticism just came with the job, and they accepted it as part of it.
The reason Bush did not respond to his critics more forcefully was because he just did not care about criticism that much. It really did not bother him at all. He just smiled, and went on with what was best for the country. In the long run, that tendency hurt him and his agenda. But, again, I admire his professionalism.