Have there been any other polls here? If not I'd say without any other information it's Lean R, not Likely.
All I have been able to find was another Sutton internal from late July that had Noem at 46 and Sutton at 42. If there could be a big surprise, I wouldn't be surprised if it was South Dakota. It's easy an easy state for people to overlook. Honestly, it seems Sutton has more of a chance than Heitkamp at this point. It's much easier for states to elect governors not of the dominant party in the state than it is to send senators to Washington. Think of John Bell Edwards, Charlie Baker, Phil Scott, Susana Martinez, Mike Beebe, and Phil Bredesen.
