Senate candidate J.D. Vance's vulnerabilities are now a matter of public record, thanks to the accidental publication of a group backing him.

The Trump-endorsed candidate employed a super PAC, Protect Ohio Values, to conduct research on his behalf, including compiling an opposition research file on Vance's vulnerabilities. But the research file, among other documents related to Vance, was published to a public Medium page, inadvertently giving the public access to it, Politico wrote Thursday.

Vance's $1.4 million mansion in Cincinnati could attract lines of attack from Democrats, the vulnerability report found. His nonprofit organization, Our Ohio Renewal, spent "more than 95 percent of its 2017 fundraising on staff salaries and overhead, and $0 on charitable activities or grants," the researchers added.

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The other documents listed on the public page include polling reports and audio and video clips for Vance to use in political ads.

Vance won Ohio's GOP primary for the Senate on Tuesday, beating out former state Treasurer Josh Mandel, businessman Mike Gibbons, state Sen. Matt Dolan, and Jane Timken, a former state party chairwoman. His victory marked the 55th time a Trump-endorsed candidate has either won or moved into runoffs.

The author of the bestselling memoir Hillbilly Elegy will face Rep. Tim Ryan (D-OH), who won the Democratic nomination that same evening.

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Ohio's Senate seat became open when Republican Sen. Rob Portman declined to seek reelection this year.

Protect Ohio Values has not yet responded to the Washington Examiner's request for comment.