Earlier this week, Graham Platner was hoisted from a frenzied mosh pit onto a stage in Portland. As a well-known Celtic punk band played, he growled lyrics in his graveled baritone voice, and then plunged back into a sea of eager hands, which passed him around in the air. Two days later, Gov. Janet Mills cut a ribbon for a new energy storage facility in Gorham before quietly making the rounds of several local businesses. She spoke warmly with local proprietors about personal backgrounds and policy with a small campaign team in tow. The contrast of styles in Maine’s Democratic...