Republican Rep. Marsha Blackburn is leading Democrat Phil Bredesen by at least 5 percentage points in two new polls of the Tennessee Senate race.One is an NBC/Marist poll, which has Blackburn with 51 percent support of likely voters while Bredesen has 46 percent support. This poll of 417 likely voters was conducted between Oct. 23-27 and has a margin of error of 5.7 percentage points.The other poll from Vox Populi Polling shows Blackburn ahead of Bredesen, a former governor for the state, by 6 points—53 percent to 47 percent. This survey of 780 “active voters†was taken between Oct. 27-29...