UPDATE: Rudy Giuliani weighs in: "I strongly believe that Judge Silberman’s decision deserves to be upheld by the Supreme Court. The Parker decision is an excellent example of a judge looking to find the meaning of the words in the Constitution, not what he would like them to mean." This should help him with the gun-rights folks.
ANOTHER UPDATE: Fred Thompson comments: "The Second Amendment does more than guarantee to all Americans an unalienable right to defend one’s self. William Blackstone, the 18th century English legal commentator whose works were well-read and relied on by the Framers of our Constitution, observed that the right to keep and bear firearms arises from 'the natural right of resistance and self-preservation.' This view, reflected in the Second Amendment, promotes both self-defense and liberty."
MORE: David Hardy has thoughts on the question presented.