In a political age that prizes charisma over conviction, Ron Paul’s career stands out as a long series of principled noes. The Texas physician–turned–congressman won his first seat in 1976, lost it a few months later, then returned repeatedly to the House, always as an outsider and always carrying the same simple message: the federal government must be bound by the Constitution, money must be sound, markets must be free, and peace is a moral imperative. As he turns ninety today, it is worth revi...