I took this political compass quiz a few weeks ago, I liked it's thoroughness. I'm pretty sure the people at r/neutralpolitics recommended it (a fantastic subreddit by the way).
America’s Most Popular Online Voting Guide
My results:
1) Green Party 86%
2) Libertarian 80%
3) Democrat 80%
4) Socialist 50%
5) Republican 9%
At first I was really shocked that my GOP score was only 9%, but not after I thought about it. To me, my results showed some validity to Ralph Nader's claim that Americans on the Right and Left actually agree on a ton of issues, they're just off the table due to corporate control of Congress. If I lined up with 86% of the Green Party and 80% of Libertarians...that should say something significant about how close the thinking is out there. And, how much of an idea dumpster fire the Republican Party is.