This is a good day, with the snow starting to come down heavy in storm-braced New York, to look at the only memorable image to come from the State of the Union address. That image came from the response, by Joni Ernst, Iowa’s new U.S. senator.

She spoke, at the top of the speech, of her childhood in Red Oak, the town in southwestern Iowa where she grew up: “As a young girl, I plowed the fields of our family farm. I worked construction with my dad. To save for college, I worked the morning biscuit line at Hardee's. We were...