GOP Rep. Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE has a 7-point lead over Democratic Rep. Krysten Sinema Kyrsten SinemaReplacing Justice Ginsburg could depend on Arizona's next senator Why Trump, GOP are running into trouble in Arizona Gun control group to spend at least million in Arizona ahead of November MORE in their battle for an Arizona Senate seat, according to a new poll released Thursday.

The ABC15 Arizona and OH Predictive Insights shows McSally with the support of 52 percent of likely voters, compared to Sinema's 45 percent. Only 2 percent of voters remain undecided.

The ABC15 poll surveyed 600 likely voters between Oct. 22 and 23. The margin of error for the sample is 4 percentage points.

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The poll differs from several others that have been released in recent days that showed Sinema with an edge over McSally.

A CNN poll released Wednesday, which interviewed voters Oct. 24-29, gave Sinema a 4-point lead, right at the edge of the margin of error for the sample (4 percentage points).

A poll by NBC News/Marist conducted Oct. 23-27 showed Sinema with a 6-point lead, and a poll by CBS News/You Gov conducted Oct. 23-26 showed Sinema with a 3-point edge.

A New York Times poll earlier this month had McSally up by 2 points.

OH's chief pollster Mike Noble noted in his survey that independent support for McSally was key to her advantage.

“The game-changer comes from Independent voters, who have swung from Sinema to McSally since our last poll," he said.

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Noble also told ABC 15 that the Supreme Court nomination process of Justicehad pushed the race toward McSally.

"If Kavanaugh didn't happen I think it'd be an extremely tight race," he said.