No, I haven't. But did you ever encounter people in Maine who felt kinship with the Confederacy?

Do you mean people who are overly zealous about the history of their state, people who are bigoted, or both? Because yes. Everywhere. Not just Maine.

Given the distant and not-so-distant history of the South, my personal experience is that attitudes are different there than elsewhere. But, of course, that's anecdote, not data.