David Perdue and Michelle Nunn squared off in their first real debate for Georgia’s open Senate seat just a few days ago, meeting before a rowdy audience that helped make the contest a spirited affair. For national outlets, the headlines wrote themselves. Perdue dared deal with “economic reality” in the days preceding the debate, and Nunn’s predictable attacks were what they chose to shine the spotlight on. The far bigger story should revolve around the largest industry in the state of Georgia, that being agriculture. Michelle Nunn’s campaign plan, leaked in late July after Perdue clinched the GOP nomination, included...