I love online quizzes. I recently stumbled upon a website called Rule of Law Revolution where there are numerous quizzes on the Constitution and the Rule of Law. But be forewarned, the questions are tough.
Many politicians like to use the phrase "rule of law" but within the context of their speech it becomes obvious that what they really mean is very often the opposite of the historical meaning the phrase. EconTalk has a podcast of Richard Epstein on The Rule of Law. (Now that was a lot of links.)