Lean R -> Tossup.
Polling consistently has Bredesen ahead, but the risk remains that TN voters will come home to the GOP and Strickland/Bayh/Thompson Bredesen.
Seems like a reasonable rating change. Across five polls conducted since March, Bredesen averages a 47-41% advantage, and leads Blackburn in all five polls by margins ranging from one to ten points.
Axios/Survey Monkey, 4/2-23, D+1
Mason-Dixon, 4/17-19, D+3
Garin-Hart-Yang (D-Bredesen), 4/9-11, D+10
Middle TN State Univ., 3/22-29, D+10
PPP, 3/15-16, D+5