CNN - Former President Donald Trump is a cultural phenomenon. His dominance in the Iowa caucuses over well-funded and high-profile competitors this week proved it. For his legion of passionate supporters, he is more than a politician. He is like a sports team or a rock band that helps define who they are as much as the families and communities to which they belong. Republican rivals, led by former U.N. Ambassador Nikki Haley and Florida Governor Ron DeSantis, have been unable to shake the loyalty of voters to Trump. Indeed, the entire “anti-Trump” contingent in the party, from conservatives who...