Constitutional Amendment needed to protect privacy

As you  probably know by now, Obama basically passed the buck to Congress to try to take the NSA monster. It's too bad he values our privacy so little. It seems like just about every week we find out about some new super-duper spying technique they have developed.  This  excellent  article about James Madison, libertarianism, the Fourth Amendment, etc. argues that we need a constitutional amendment to limit government spying.  The Fourth Amendment and existing protections don't go far enough.  I second that motion.