Sen. Thom Tillis Thomas (Thom) Roland TillisTillis appears to reinforce question about COVID-19 death toll Billionaire who donated to Trump in 2016 donates to Biden Collins: Winner of presidential election will be sworn in next year MORE (R-N.C.) is nearly tied with his Democratic challenger as he runs for reelection in North Carolina, according to a left-leaning pollster.

Former state Sen. Cal Cunningham (D) leads Tillis by 41 percent to 40 percent, according to a survey released to The Hill from Public Policy Polling.

The poll also showed Tillis's approval ratings in the state to be underwater, with 23 percent of North Carolina voters saying they approved of the way he does his job in the Senate, and 46 percent saying they disapproved.

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Cunningham, a veteran of the Iraq War who served as an Army prosecutor, is the third Democrat to enter the race against Tillis.

A previous poll from Emerson College released earlier this month showed Tillis also trailing North Carolina state Sen. Erica Smith (D), another of his Democratic challengers, by 39 percent to 46 percent.

Mecklenburg County Commissioner Trevor Fuller is Tillis's third challenger.

Tillis is seen as one of the more vulnerable Republicans in the upper chamber, making Democrats hopeful they can make inroads in the Tar Heel State. Former President Obama won the state in 2008, but Republicans Mitt Romney Willard (Mitt) Mitt RomneyTrump 'no longer angry' at Romney because of Supreme Court stance GOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' MORE and President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE won it in 2012 and 2016.

Republicans currently have a 53-47 majority in the Senate, and Majority Leader Mitch McConnell (R-Ky.) is set on keeping it in 2020.

The Public Policy Poll was commissioned by VoteVets and was conducted on June 17-18, among 610 North Carolina voters. The poll's margin of error is plus or minus 4 percentage points.