In many ways, Terri Hall was on a collision course with Texas toll road policies long before she and her family loaded up their van and drove from California to the Hill Country three years ago. A lifetime of volunteering, a hunger for staying on top of politics, and strong religious and moral convictions helped hone Hall's activist instincts. Her brains, drive, superb speaking skills, engaging personality and wholesome good looks — noted by friends and enemies alike — make Hall especially effective. They help explain why this 37-year-old mother of six is a leading force in a populist assault...