The left/right labels we normally use to describe political camps are flawed. A better (or additional) judgement is to use a scale between total power and zero power. The graphic here shows this very nicely. (note the ‘you are here label’ too)
The video “Overview of America” by the John Birch Society explains more about these different forms of government from a slightly different point of view:.
[a few new graphics found Jan 2016 below]