D'oh. I had looked up, previously, to find out that felons can usually vote and extrapolated Maine to be the same as the rest, with regards to voting while incarcerated. My bad, the rest is correct however.

I know Maine allows it, and even encourages it. I actually started a campaign for State Senate at one point. As I got closer to election, I learned more about the system and decided I couldn't participate in that. So, I never turned in all the signatures and didn't run.

But, thanks for the correction. For some reason, I'd assumed the rest of the States allowed it. I understand that, in Maine, some candidates have even campaigned, in person, in the prisons. Notably, we don't actually have a lot of prisoners or very dangerous prisons.