One of the things that has troubled me the most about Donald Trump is his lack of emotional maturity. Unlike with a reality TV show host, it is vital that the president of the United States be grown up and mature. But Trump, time and time again, acts like a child, name-calling, holding grudges, and crying when things don't go his way. Case in point: the Iowa caucuses. On election night Trump grudgingly congratulated Ted Cruz. But now he's saying that Cruz "stole" the Iowa caucuses by repeating a news report that Ben Carson was about to leave the presidential...