The Victor Emporium stands proudly on Main Street in Victor, Idaho, its red-trimmed windows and striped awnings beckoning travelers like a dessert lighthouse guiding ships to shore.

The sign in the window proudly proclaims it as the “HOME OF THE WORLD FAMOUS HUCKLEBERRY MILKSHAKE,” and generations of Idahoans will testify that this isn’t mere hyperbole – it’s gospel truth.

Some energy analysts say Trump’s support of coal is mostly symbolic, since utilities hold the keys. Others say diversifying ...