It's a tragedy that Milton Friedman—born 100 years ago on July 31—did not live long enough to combat the big-government ideas that have formed the core of Obamanomics. It's perhaps more tragic that our current president, who attended the University of Chicago where Friedman taught for decades, never fell under the influence of the world's greatest champion of the free market. Imagine how much better things would have turned out, for Mr. Obama and the country.

Friedman was a constant presence on these pages until his death...