Although the Mason-Dixon survey is the latest to show Bredesen with a lead over Blackburn, the congressman’s performance in East Tennessee provided her a bright spot.

Forty-eight percent of respondents from East Tennessee said they would vote for Blackburn if the election were immediately held, compared to 39 percent for Bredesen.

Bredesen maintained a lead among respondents in both Middle and West Tennessee. In Middle Tennessee — where both candidates reside — Bredesen had a 49 percent to 42 percent advantage over Blackburn.