Forty years ago, corporate agribusiness launched a campaign to push small grain farmers to modernize or perish, or as Nixon's secretary of agriculture Earl Butz put it, "get big or get out." But 27-year-old David Oien decided to take a stand when he dropped out of grad school to return to his family's 280-acre farm, becoming the first in his conservative Montana county to plant a radically different crop: organic lentils. A cheap, healthy source of...