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The race for the Wisconsin Senate is a virtual toss-up, with Republican Sen. Ron Johnson giving Democratic challenger Mandela Barnes the edge within the margin of error in a Marquette University Law School poll.

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Nearly 50% of potential voters said they support Johnson in the race, compared with 48% for Barnes, according to a Marquette poll of 679 potential voters. The margin of error for a sample of likely voters to vote is plus or minus 4.8 percentage points.

Marquette Law School defines “potential voters” as “those who say they are certain to vote or who say they have already voted.”

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In a slightly larger sample of 802 registered voters, Johnson maintains 48% support versus Barnes’ 45%.

The Marquette Law Poll was conducted from October 24 to November 1 via landline and cell phone. The margin of error in the registered voter sample is plus or minus 4.6 percentage points.

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Liberal groups in Wisconsin seeking to change the rules governing absentee ballots suffered a setback this week after an appeals court and a circuit judge ruled that ballots cannot contain partial addresses of witnesses.

US Sen. Ron Johnson, R-Wis., left, and his Democratic challenger Mandela Barnes shake hands before a televised debate in Milwaukee, Friday, October 7, 2022.

In his order, Judge Juan Colas wrote that Wisconsin elections have been held for 56 years without a legally binding definition of what constitutes a witness’s address on a ballot. He said that on non-binding guidance from the Wisconsin Election Commission, its predecessors and advice from attorneys, clerks are legally free to interpret the term in good faith.

current guidance from Wisconsin Election Commission is that an address must consist of three elements: a street number, street name and municipality.

Fox News’ Bradford Betz contributed to this report.