AUSTIN, Ind.—Steering his white Dodge Ram while wearing a tan knit cap, a drab green Carhartt coat and a smear of brown livestock feed on his cheek, Terry Goodin jounced over frozen-hard mud toward his 100 head of beef cattle. “Make sure they’re all four legs down and not four legs up, in this kind of weather,” he told me in his southern Indiana drawl. The temperature overnight had dipped toward zero. Now, midmorning, it stood at 16 degrees. On the rear of his old pickup truck was a “Farmers For Goodin” bumper sticker, and rattling around his head were thoughts of what he was going to say the following week in a starkly different setting—up in Indianapolis, at the regal limestone capitol building, in his introductory speech as the leader of his caucus in the state legislature.