The anti-immigrant politics at the heart of Mr. Trump’s demand for a wall also clash with Maryland’s interests. Though not a border state, Maryland’s economy is highly dependent on immigrants, who make up a disproportionate share of its entrepreneurs as well as its workers in the top echelons of its economy (medicine, biosciences, engineering, etc.) and its lower rungs (construction, agriculture, etc.). A 2016 report by the Department of Legislative Services found higher workforce participation and lower unemployment among the state’s immigrants than its native born population. Particularly in the Washington region, immigrants (legal and otherwise) are the prime drivers of Maryland’s growth. It’s not surprising, then, that Mr. Hogan does not traffic in anti-immigrant rhetoric and has publicly objected to some Trump administration policies, including forced family separations at the border and limits on guest worker visas. But he could do more. Touting the benefits of immigration was once a mainstream position in the Republican Party, and Mr. Hogan is ideally positioned to give voice to it again.