We have now had four consecutive polls (NBC/Marist, Fox, Emerson, and CNN/SSRS), showing Blackburn up by low to high single digits. Tennessee is beyond reach for the Democrats at this point, a fact that is driven even further home by the very high Republican turnout that has been observed there. Anyone still entertaining any hopes in Bredesen at this point is sorely misguided.
Yet, it's also low enough to explain why the Republicans are still pumping money into this. The only chance Bredesen has is that his favorable have tended to be higher, but I wouldn't put that any higher than 10%.