Are you familiar with KrisAnne Hall?
She's a fantastic scholar of The Constitution. She knocks it out of the park in this video.
When I lectured on federalism to Tea Party groups in Georgia 5 years ago, I had them eating out of my hand. At the end of the lecture, I was mobbed by the crowd, and fortunately I had handouts to make my points.
I condensed the lecture into an essay here.