A good site for info on constitution:
http://www.usconstitution.net/consttop_intr.html
The Constitution is short; it cannot and does not attempt to cover every eventuality. Even when it seems it is clear, there can be conflicting rights, conflicting spheres of power. When disputes arise, it comes time for people, and most importantly judges of the Judicial Branch, to interpret the Constitution. The concept of constitutional interpretation is foreign in some countries, where the constitution makes a reasonable effort to cover every eventuality. These constitutions are generally rigid and little changing, adapting slowly to advances in political views, popular opinion, technology, and changes in government. The U.S. Constitution, however, has been termed a Living Constitution, in part because it grows and adapts to internal and external pressures, changing from one era and generation to the next.
When a new situation arises, or even a new variation on an old situation, the Constitution is often looked to for guidance. It is at this point that the various interpretations of the Constitution come into play.
There is no one right way to interpret the Constitution, and people often do not always stick to one in