Herman Cain's campaign is quickly denying the claim from a Chicago-area woman who is accusing him of making an unwanted sexual advance more than a decade ago.

A statement says, "All allegations of harassment against Mr. Cain are completely false."

The accuser, Sharon Bialek, says she's coming forward to provide "a face and a voice" to support other accusers who have remained anonymous so far.

She said that after a dinner in July of 1997 with Cain -- whom she had contacted in hopes of finding a job -- they were in a car together for what she thought was a ride to an office building.

Instead, she says, Cain put his hand on her leg and under her skirt.

She says he also pushed her head "toward his crotch." According to Bialek, when she told Cain to stop, he did.

She appeared at a news conference in New York today alongside attorney Gloria Allred, who said Bialek is a registered Republican and a woman with a long and successful work history.

Bialek said she wants Cain to "come clean" and "admit you were inappropriate to people."

Cain spent much of last week denying allegations by three women who remained anonymous.