1. http://www.isidewith.com/ (be sure to check out the alternate answers
This next quiz is new to me and is also helpful.
2. http://www.theadvocates.org/quiz
I encourage everyone to vote by principle. These quizes will help you figure that out. You may be surprised, I've had several people I know take the I Side With quiz and be surprised with the result. That is okay though, it's based on your principles and it's very hard to see which candidate really fits you best with all that's out there.
One more thought:
Vote by who you think ought to win, not for who you’re told is the best bet to get rid of who you don't want to win. Why do we let others convince us our values are not worth voting for? When we allow others to convince us we are wasting our vote by voting our conscience (instead of the party line) then we are allowing them to debase our values. If we keep on listening to their siren voices we will soon find ourselves lulled on the wrong side of the line we drew.