I think if there's any truly surprising Senate upset next week, it'll be Bredesen eking out a win. He's arguably the best non-incumbent Democratic Senate candidate the party could have hoped for not only in TN, but in the entire South. That doesn't mean he's going to win, but it does means nobody else would have done better in his shoes.
I'd be perfectly content with sacrificing Heitkamp to the election gods if it means we get Bredesen in return.
This looks very much like the 2002 Gubernatorial race in TN, when Bredesen won by 3%.
The polls back then were similar to what they were now, just that 2002 was more a Republican year.
I'm trying to research those polls, but nothing comes up. Do you happen to have a link to them?