Yep, basically Clinton needs to hold onto Pennsylvania, New Hampshire, Michigan and Wisconsin (and keep the others she has a big lead in). If Trump takes Pennsylvania and Florida and Ohio then it's gonna get pretty dicey for her.
Well on top of that, Trump is down only 3 for the rest of Maine, and a Reuters poll out today now has him up in Colorado. Trump definitely has the enthusiasm edge, while Hillary has the Democratic machine that cranked out a lot of votes for Obama.
The poll I saw was +3 in Maine. But that was a poll of all of Maine (including the part that has the better chance of giving him points).