Herman Cain is still going strong. Fundamentals drive elections, and base appeal drives primaries. Cain is personable, likable, reliably conservative, and gives decent debate performances. There's no accuser out there making noise, just a lot of semi-anonymous rumors being leaked to newspapers. The reaction of the typical Republican primary voter is predictable: "So what if he was accused of sexual harassment? What CEO hasn't been accused of sexual harassment? It was a long time ago, and we'll never really know what happened."
In the newspaper reporter's mind, presidential campaigns rise on the merits of their platforms and fall when scandals break. But that's rarely how it works in the real world. Remember Jeremiah Wright, the guy who was going ensure Obama never became president? Remember how Monica Lewinsky ruined Bill Clinton's political name forever? All Cain has to do is hang in there, and the strength of his connection with the values of primary voters (as well as the weakness of his opponents) will carry him through this rough patch.