Haley and De Santis manage to get 40% of the vote in an agricultural state where farmers are a large voting bloc and tend to be evangelical. Many of these farmers voted for Mr. Trump giving him 51% of the vote in the Iowa caucuses. See the article below in the WSJ report from counties in Iowa with large evangelical vote that is shifting to Mr. Trump in the belief that he was good for rural America and that he could give Republicans a better chance for a four year term.