The Library of Congress, through its website Congress.gov, has a great resource for constitutional law scholars: The Constitution Annotated.
From the website:
"The Constitution of the United States of America: Analysis and Interpretation (popularly known as the Constitution Annotated) contains legal analysis and interpretation of the United States Constitution, based primarily on Supreme Court case law. This regularly updated resource is especially useful when researching the constitutional implications of a specific issue or topic. The Featured Topics and Cases page highlights recent U.S. Supreme Court decisions that demonstrate pivotal interpretations of the Constitution's provisions."
The annotations are categorized by article or amendment. The first part of the PDF is the text from the Constitution followed by the analysis from SCOTUS cases on point.
Along with the Constitution Annotated, Congress.gov also has the U.S. Founding Documents to view.
There's also an app for that! U.S. Constitution: Analysis and Interpretation by Library of Congress is available to download for the iPhone or iPad.