Tens of millions of Americans, from Generation X-ers to baby boomers and beyond, are rediscovering libertarianism, a visionary alternative to the tired party orthodoxies of left and right. In 1995 a Gallup poll found that 52 percent of Americans said "the federal government has become so large and powerful that it poses an immediate threat to the rights and freedoms of ordinary citizens." Later that year, The Wall Street Journal concurred,...