As you would expect from the Heritage Foundation, this is an Originalist reference book, and the editors have done an excellent job of explaining the Constitution as envisioned by the Framers. But it also explains the Constitution as applied in contemporary law, which means the book describes how courts have interpreted the Constitution.
The Heritage Guide to the Constitution covers each clause of the Constitution and the twenty-seven amendments. Each article includes a description of the original understanding, current law associated with the clause, and historic development of current doctrine. Articles also include credible differing interpretations of original understanding. Significant court cases and interrelated clauses are cross-referenced.
“I cannot accept this invitation [to celebrate the bicentenial of the Constitution], for I do not believe that the meaning of the Constitution was forever ‘fixed’ at the Philadelphia Convention… To the contrary, the government they devised was defective from the start.” Thurgood Marshall, Supreme Court Justice.
“The United States Constitution has proved itself the most marvelously elastic compilation of rules of government ever written.” Franklin Roosevelt, President
“The words of the Constitution … are so unrestricted by their intrinsic meaning or by their history or by tradition or by prior decisions that they leave the individual Justice free, if indeed they do not compel him, to gather meaning not from reading the Constitution but from reading life.” Felix Frankfurter, Supreme Court Justice