There could be 2 reasons for this result:
It's DFM Research, which already produced one of the most crappy ND polls in 2008, showing Obama winning by 3 when he lost by 9.
http://www.dailykos.com/story/2008/10/16/632664/-ND-Pres-Another-poll-shows-Obama-leadOr ND is becoming another Wyoming or Oklahoma because of the energy boom in the state.
The problem is we'll probably not getting more polls from credible sources such as PPP, Mason-Dixon or SurveyUSA.
Anyway, here is the release:
http://www.scribd.com/doc/91567464/DFM-Survey-Memo-4-27