I don’t think it’s going to hurt. The charges were investigated and the investigation found the charges untrue. Period. When that is clear, I think this scurrilous attack will help Cain.
I think the finger is pointing to the Romney team as the originator of the Herman Cain sexual harassment allegations. This effort to destroy the Cain campaign will backfire and have a damaging effect on the Romney campaign. It may even sink his campaign if the charges are as baseless as they were determined to be some 20 years ago.