The complaint against Mr. Strider was made by a 30-year-old woman who shared an office with him. She told a campaign official that Mr. Strider had rubbed her shoulders inappropriately, kissed her on the forehead and sent her a string of suggestive emails, including at least one during the night, according to three former campaign officials familiar with what took place.

The complaint was taken to Ms. Doyle, the campaign manager, who approached Mrs. Clinton and urged that Mr. Strider, who was married at the time, be fired, according to the officials familiar with what took place. Mrs. Clinton said she did not want to, and instead he remained on her staff.

The woman who made the accusation against Mr. Strider in 2008 has not spoken publicly about it. She, like most campaign staffers, signed a nondisclosure agreement that barred employees from publicly discussing internal dynamics on the campaign, according to two people with direct knowledge of the contract. Reached by a reporter, she declined to comment.