A Political Graph of US Politics to describe reality (VANITY)

I am a graphically minded person, and have struggled with a way to effectively portray the reality of our political system in America, and none of the graphic descriptions I see describe it the way I see it. I have given this much thought over the years, and I have always found this particular question puzzling: why would they have ever given us this model shown below?The only way this graph above (which is the traditional one accepted by the vast majority of Americans) makes any sense is if it were created and pushed by people who were either Communists...