Yeah I'm aware of 2002, but everything went wrong for the GOP that year - the TennCare disaster, Sundquist's unpopularity, Bredesen's reputation as a moderate Democrat, the state income tax, etc. And needless to say, the state was much less Republican and polarized back then. I know it's an open seat, but I don't expect the Democrats to win this race in the end. Dean could easily crack 40% if the Rs nominate someone like Blackburn, though, and there will probably be polls showing a close race.
But I agree that there's nowhere to go but up for TN Dems.