Sen. Debbie Stabenow (D-Mich.) holds a 9-point lead over Republican challenger John James in Michigan's Senate race, according to a new poll that shows a tightening race.

Stabenow has the support of 51 percent of likely voters, compared to James's 42 percent, according to the poll released Thursday by Mitchell Research and Communications.

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In a previous poll released in September, Stabenow had a 13-point lead.

Steve Mitchell, president of Mitchell Research and Communications, said the new polling signals a tightening race and shows the impact of Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE's contentious confirmation process.

Mitchell added that Stabenow is still "in a good position."

"However the race is tightening and with a month to go, a great deal can happen. ... This race is far from over at this time," he said.

James is a businessman who is backed by President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE. Trump's son, Donald Trump, Jr., plans to campaign next week for James.

The nonpartisan Cook Political Report rates the race between Stabenow and James as "likely Democrat." FiveThirtyEight rates the race as "solid Democrat."

A RealClearPolitics average of polling shows Stabenow with a 16-point lead.

The results of the poll released Thursday were based on surveys of 654 likely voters in Michigan from Sept. 30 to Oct. 7. The poll has a margin of error of 3.8 percentage points.