Hill, a law professor, charged Supreme Court Justice Clarence Thomas 20 years ago with sexual harassment.
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Cain was making a campaign stop in Kalamazoo, Mich., on Thursday when a person in the crowd mentioned Hill. He laughed and said: “Is she going to endorse me?”
A video of the exchange aired Thursday night on FOX News Channel’s “Special Report With Bret Baier,” The New York Daily News reported.