Maine a swing state? What are you smoking?
It is purple leaning blue. Almost blue in fact. But, as Barone pointed out the under thirties voted for Bush over Gore in 2000. That is a good sign for the future.
Well, maybe it's not as competitive as NH but it's still a "swing state" (even though it has been leaning towards the Democrats lately). It has two Republican (OK, I know they are RINOs but still) Senators. In the State Legislature the Democrats have a very, very slim majority (74-73 in the House and 19-16 in the Senate), so I think it's pretty reasonable to call it a swing state.