60 Minutes did a very interesting profile of controversial Supreme Court Justice Antonin Scalia. In part 1 (which you can watch below), Scalia defends his judicial philosophy of originalism. (You can watch the other parts at YouTube).
For my own part, I must heartily endorse Scalia's reasoning. If you allow for courts to redefine the meaning of the Constitution, then the document ceases to be a constitution. It becomes merely a platform for the judiciary to make policy for the nation.
Scalia has been a stalwart champion for keeping the judicial branch of government in its place - that of interpreting the law (within set boundaries of interpretation) - and deferring to the legislative branch of government the RIGHTFUL perogative of making and changing laws.