Only 56% for Collins? That's the lowest I've seen to date I think. Yet her margin is larger than in the last Maine poll (where she was 22% ahead). I think most of the undecided are Democratic-leaning though, anything else would be a shock.
You may want to take a second look at your election predictions. Branstad is not hitting 80%, nor is Kasich or Coakley hitting 70%, Wolf and Cuomo aren't going to reach 90%, nor is Davis going to reach 60%, etc. etc. Keep in mind that the %'s are meant to reflect the actual vote share of the winning candidate, not their chance of victory.