In addition, The Las Vegas Journal-Review reported this past week that a second, unnamed accuser had come forward.
While Mr. Kihuen was relatively unknown before the harassment allegations came to light, he is from the politically critical swing state of Nevada, where he had just wrested a seat from a Republican.
As allegations of sexual harassment have cost men their jobs in a range of industries — media and entertainment, academia and the arts — Congress has faced its own problems over the way women are treated in the workplace.
On Thursday, Representative Blake Farenthold, Republican of Texas, announced that he would not seek re-election. Mr. Farenthold settled a harassment claim filed by his former communications director for $84,000, paid for with taxpayer money.
Senator Al Franken, Democrat of Minnesota, has said he will soon leave Congress over allegations that he forcibly kissed one woman and groped others during photo opportunities. Representative John Conyers, Democrat of Michigan and the longest-serving member of the House, recently quit his job after several former employees accused him of harassment.
And Representative Trent Franks, Republican of Arizona, was forced out by Speaker Paul D. Ryan after it was disclosed that he had offered to pay an aide $5 million to carry his child as a surrogate mother — an offer that left her worried that the lawmaker wanted to have sex as a means of impregnating her.