Not even three million people live in the U.S. state of Iowa. But on Jan. 3, voters there will determine the fate of those seeking to become America’s next president. The battle has begun in earnest. The United States is a country that likes to explain democracy to other nations. It is also a country that starts wars to bring democracy to the world. It allows the candidates for its highest office, the presidency, to spend a year and a half campaigning, leaving no stone unturned as it delves into their past. Its political mood is gauged on a daily...