Former Democratic Governor Phil Bredesen and Rep. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R) are locked in a dead heat in their Senate race in Tennessee, according to a new NBC News/Marist poll released Thursday.

About 48 percent of likely voters support Bredesen compared with 46 percent who support Blackburn. Only five percent are undecided.

Both are vying 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) in the election in November.

ADVERTISEMENT

The poll shows Bredesen remains popular among voters, with 61 percent of likely voters saying they have a positive view of the state's former two-term governor, while 22 percent have a negative view.

Meanwhile, 46 percent of likely voters had a favorable view of Blackburn, compared to 36 percent who have an unfavorable view of her.

The poll also showed President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s approval rating at 47 percent of likely voters, compared to 43 percent who disapprove. Trump had won the state by 26 points in 2016.

However, Republicans hold a 12-point lead in congressional preference among Tennessee likely voters.

Trump has endorsed Blackburn and slammed Bredesen, tweeting last month, “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

Bredesen has steered clear of issues championed by the progressive wing of the Democratic Party, focusing instead on more local issues.

In an interview with The Hill, Bredesen called the national party’s brand “terrible,” arguing it has moved away from focusing on opportunities for middle- and working-class families.

Political strategists see a path to victory for Bredesen if he can win over Republican voters, especially in suburban and rural Tennessee.

NBC News/Marist interviewed 940 adults, including 538 likely voters from Aug. 25-28. The poll has a margin of error of +/- four percent for all adults and +/- 5.1 percent for likely voters.