Dr. Sanity explains Bush Derangement Syndrome:
This psychological defense mechanism is referred to as ‘displacement’. One way you can usually tell that an individual is using displacement is that the emotion being displaced (e.g., anger) is all out of proportion to the reality of the situation. The purpose of displacement is to avoid having to cope with the actual reality. Instead, by using displacement, an individual is able to still experience his or her anger, but it is directed at a less threatening target than the real cause.
H/T: Blue Goldfish