Sen. Joe Donnelly Joseph (Joe) Simon DonnellyTrump taps Amy Coney Barrett for Supreme Court, setting up confirmation sprint Trump plans to pick Amy Coney Barrett to replace Ginsburg on court Harris faces pivotal moment with Supreme Court battle MORE (D-Ind.) is down 3 points in his reelection bid against businessman Mike Braun, according to a new Cygnal poll released Tuesday.

About 46 percent of likely voters support the one-term senator, while 49 percent support Braun, a gap that falls within the poll’s margin of error of 4.36 percentage points.

A combined 5 percent of likely voters say they are unsure who they’ll vote for or say they will vote for a third-party candidate. However, Donnelly has a 7-point edge among independent voters.

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Both candidates have net-positive favorability ratings. About 47 percent of likely Indiana voters have a favorable view of Braun, while 39 percent have an unfavorable view. About 52 percent of likely voters have a favorable view of Donnelly, while 41 percent have an unfavorable view.

Meanwhile, 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 has a net-positive favorability rating in The Hoosier State, with 53 percent of likely voters viewing him favorably and 45 percent having an unfavorable view.

Trump endorsed Braun and campaigned with him in August, tweeting, “Will be going to Evansville, Indiana, tonight for a big crowd rally with Mike Braun, a very successful businessman who is campaigning to be Indiana’s next U.S. Senator. He is strong on Crime & Borders, the 2nd Amendment, and loves our Military & Vets. Will be a big night!”

Will be going to Evansville, Indiana, tonight for a big crowd rally with Mike Braun, a very successful businessman who is campaigning to be Indiana’s next U.S. Senator. He is strong on Crime & Borders, the 2nd Amendment, and loves our Military & Vets. Will be a big night! — Donald J. Trump (@realDonaldTrump) August 30, 2018

Donnelly is one of 10 Democrats defending Senate seats in states Trump won in 2016. The president won Indiana by nearly 20 points.

The Cook Political Report rates the race as a "toss-up," and an average of polls compiled by RealClearPolitics has Braun up by 0.5 percentage points.

Cygnal surveyed 505 likely Hoosier voters from Oct. 26 to 27. The poll has a margin of error of 4.36 percentage points.