For instance, take most "conservative" European governments and place them in our political paradigm and they would be what we call "liberal." Send Obama to Europe and he's a moderate conservative. Hardly do we hear such a label depicting Obama here in America.
Anyway, about 10 years ago I found the Political Compass as one of the best graphing tools of where people stand on a political spectrum. You can take the test here to see where you stand, it only takes a couple minutes.
I usually take the Political Compass test once a year just to see if I've changed and how much. As for me, I've generally floated right around the middle with sometimes veering toward a left-libertarian. It usually varies slightly each time. I took it this morning and I see I'm coming back closer to the middle again.
As you can see from the graph, thinking in terms of left and right is very inaccurate. When you place current American political leaders on the compass you really see what I'm talking about.