Thanks to Mr. Trump, the 2016 campaign for the Republican Party'spresidential nomination has descended a primal level. Unlike Democrats Hillary Clinton and Bernie Sanders who have contained their disagreements to quibbles over policy, Messrs. Trump and Cruz are like two bull elk locking horns in a battle for domination of the herd. While polls indicate a majority of Americans are appalled by the spectacle, Trump supporters clearly love it. They are drawn to Mr. Trump less for his program -- thin as it is -- than for his imposing persona. They have bought into the idea that, as president, he would face down the Chinese, the Mexicans, corporate leaders, Islamic terrorists and Vladimir Putin and bully them into doing his will.