The Department of Homeland Security tapped a little-known ad firm to produce Kristi Noem’s multimillion-dollar ad campaign during the government shutdown last year. But when asked to explain her rationale before a House Oversight Committee hearing Wednesday, Noem was practically speechless.Reading off of a DHS notice, Colorado Representative Joe Neguse noted that the department had identified just four companies “out of the hundreds of thousands of companies in the United States” as potential hi...