Reddit reviews Constitutional Law in a Nutshell (Nutshells)
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Maybe not what you asked for, but this is basically a must-read (IMO) for anyone interested in constitutional law. You can also reference the typical supplements that law students use. They are much easier than a casebook.
Nutshell
Crunchtime
If you want a quick and small guide to the Constitution besides the original text itself, I would highly recommend this:
https://www.amazon.com/Constitutional-Nutshell-Nutshells-Jerome-Barron/dp/1634596234/ref=sr_1_2?keywords=constitutional+law+in+a+nutshell&qid=1550539091&s=gateway&sr=8-2
The book is an objective overview of Constitutional law, and will give you a solid grasp on where Constitutional interpretation currently stands by running you through all of the landmark cases that have shaped the law in the US.