The U.S. Postal Service has apologized for releasing a Democratic congressional candidate's personal information.

In a statement Thursday , the USPS said it was "human error" that led to the release of Abigail Spanberger's USPS personnel file, which included her Social Security number, among other personal data.

Spanberger was a postal inspector before becoming a CIA officer.

Now she's running in Virginia's 7th Congressional District.

The USPS released her file to the Congressional Leadership Fund, a conservative super PAC that puts out negative ads against Democrats across the country.   Spanberger's campaign alleges releasing the information was a partisan move and points to her own campaign's request for similar information, which  still hasn't been fulfilled .  More than 200 former national security professionals  released a letter  making a similar allegation and demanding an explanation from the Office of Personnel Management and the director of national intelligence.  Poll-watchers expect Virginia's 7th congressional race  to be a close one .