In the national explosion known as the midterm elections of 2018, ground zero had to be the Kansas 3rd District congressional race. There, a political novice who is Native American, openly gay and whom hardly anyone had ever heard of a year ago, swept away a historically popular, four-term Republican incumbent with 20 years of political experience, renowned for his campaigning skills and fundraising prowess. Sharice Davids was the most unlikely of candidates to beat Rep. Kevin Yoder. But that was before Yoder was body-snatched by President Donald J. Trump. To really grasp how that alliance had morphed two men...