RE: Maine----
Northern Maine has some of the highest regions of poverty within New England, as well as compared to even many extremely impoverished communities elsewhere within the United States.
https://uselectionatlas.org/FORUM/index.php?topic=267947.msg5741987#msg5741987https://uselectionatlas.org/FORUM/index.php?topic=267947.msg5743056#msg5743056Although these are only a few posts that I have made on the topic spring to mind, it is clear that Northern Maine, as well as a few similar Counties in Northern NH and VT which swung heavily towards Trump shared a few key items in common.
1.) Heavily dominance of French and French-Canadian Catholics.
2.) Massive decline of traditional manufacturing and resource based industries.
3.) Traditional resentment against the uneven nature of the recovery from the Great Recession, where although life was getting much better for folks in the larger cities, was not recovering at all in the rural ghettos and factory towns of America.
4.) Regardless of this particular poll, it is clear that there is still a large number of Obama '08/'12 > Trump '16 voters out there, who once again are more than happy to vote Democratic, so long as the Democrats nominate a candidate who will actually represent their voices and interests....
5.) There is still a strong support for many French and French-Canadians towards the Quebec Independence Movement, which after all Trump seems to support in general the concept of devolution and separatism in other parts of the world....
https://www.youtube.com/watch?v=48sQedAp0ME