This is obviously a Republican internal/junk poll.
Edit: You also left out the part where Portman leads Sittenfield 56-21, Lebron.
Omg that's really bad, even for an internal.
That's a name recognition problem. Had national Democrats backed behind Sittenfeld (unopposed), I'm fairly confident he would have the necessary resources to make up lost ground and would end up putting in a hard-fought, but unsuccessful effort against Portman.
The Portman/Sittenfeld poll is meaningless though. Strickland will be the nominee, so I would be paying more attention to the fact that regardless of how skewed this poll is, just how mediocre Strickland is viewed by Ohioans when it comes to his record as governor. Portman will wisely take full advantage of that.