The University of Arkansas did a poll towards the end of last year's campaign (10/20/04) that had Bush +7 (I had to look this one up), not out of the MOE from the +10% advantage Bush had in Arkansas last year.
However, that's the only other poll I've ever seen out of them. And it is a University poll as well.
But it is still a poll, one that is welcome for a Governor's race that I expect to be in the top-tier of governor's races nationwide.
If that is the poll I think I remember (not sure though), its internals were utterly weird.