Rep. Marsha Blackburn Marsha BlackburnNetflix distances from author's comments about Muslim Uyghurs but defends project Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-Tenn.) has a five-point edge against former Gov. Phil Bredesen (D-Tenn.) in The Volunteer State’s race to replace retiring Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.), according to a new NBC News/Marist poll released Tuesday.

The poll shows that 51 percent of likely Tennessee voters support Blackburn, while 46 percent support Bredesen. That margin is just within the poll’s margin of error.

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That is a marked improvement for Blackburn, who was behind with likely voters 46-48 in the same poll from September. A Vanderbilt University poll released recently showed Bredesen with a one-point lead, but that margin fell well within the margin of error.

Blackburn and Bredesen shore up support among traditional Republican and Democratic voting blocs, respectively. Blackburn holds double-digit leads among white evangelicals, voters without a college degree, white voters and men, while Bredesen leads among African Americans, college graduates and women. Bredesen also has a 24-point edge among Independent voters.

Both Blackburn and Bredesen’s favorability ratings have taken hits since September’s poll after the two candidates exchanged a flurry of negative ads. Blackburn has a net-negative favorability rating, with 45 percent of likely voters viewing her favorably, while 46 percent have an unfavorable view. She had a net-positive favorability rating by a 10-point margin in September.

Bredesen, who won all 95 of Tennessee’s counties in his 2006 gubernatorial reelection bid, has a net-positive favorability rating, with 52 percent of likely voters viewing him favorably, while 39 percent have an unfavorable view. He had a net-positive favorability rating by a 39-point margin in September.

Bredesen’s slip in the NBC News/Marist poll appears to be a result of disaffected Republicans coming home to their party. He has a net-negative favorability rating by a 43 percent margin among Republicans, though it was just net-negative by a one-point margin in September.

Moreover, President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE’s approval rating in the state has improved markedly since September’s poll. He has a net-positive approval rating, with 56 percent of likely voters approving of the job he’s doing as president, while 39 percent disapprove. He had a net-positive approval rating by a four-point margin in September.

The president has gone all in for Blackburn, tweeting after the Republican primary in August, “Marsha Blackburn had a BIG win last night in the Tennessee primary for U.S. Senate. She is an outstanding person & great supporter of mine. Congratulations Marsha, we need you very badly in the Senate to vote for our agenda. Your next opponent will vote against all we are doing!”

Marsha Blackburn had a BIG win last night in the Tennessee primary for U.S. Senate. She is an outstanding person & great supporter of mine. Congratulations Marsha, we need you very badly in the Senate to vote for our agenda. Your next opponent will vote against all we are doing! — Donald J. Trump (@realDonaldTrump) August 3, 2018

While The Cook Political Report rates the race as a “toss up,” an average of polls compiled by RealClearPolitics, which does not yet include the NBC News/Marist poll, has Blackburn up 6.5 points.

Democrats view Tennessee as one of only a handful of possible pick up opportunities in a Senate map that has them defending 10 seats in states Trump won in 2016. Were Republicans to successfully defend the seat, it would greatly increase their chances of maintaining or expanding on their 51-49 majority.

The NBC News/Marist poll surveyed 471 likely voters from Oct. 23-27 and has a margin of error of +/- 5.7 percent.