You're probably wasting your time. The US has its own Steve Jobs-esque distortion field when it comes to politics. I'm not sure the majority of them could ever be educated what "left" and "right" actually mean and you'll certainly never convince them that both their main political parties are actually center right and far right.
This "distortion field" sounds suspiciously like relativity. Are you sure you aren't just declaring your political sphere the center of the universe and labeling anyone who uses a different reference point as a heretic?
Wait, what? I'm declaring the rest of the world the "center of the universe" and labeling the one (first world) place that uses a drastically different reference point as wrong.
It is relativity, but the problem is that most people here don't understand that the parties are center right and far right relative to most other developed countries.