onald Trump is back in the lead in Iowa. According to a new CBS News poll, 30% of Republicans in the state now support him. Ben Carson, who was tied with Trump a month ago, has slipped to third. The terrorist attacks in Paris appear to be the reason. Conservatives are looking for candidates who show the knowledge, passion, and determination to destroy ISIS. Carson, a friendly, upright man, is not a conservative powerhouse, and his knowledge and moral clarity about foreign policy does not compare with the two candidates now ahead of him. Trump is not an expert either,...