I suspect that Cain's campaign is now effectively fatally damaged. But continuing the fight denies the victory to the headhunters in the short run.
Where will he go to get his reputation back if this newest "accuser" is also discredited like the others?
“But continuing the fight denies the victory to the headhunters in the short run”
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I think you might be on to something. But, I think it might also have something to do with Newt, who supported Mr. Cain today. The two are reportedly good friends. If Cain departs on alleged infidelity, where would that leave Newt?