I don't agree with him on every point, but Quin Hillyer provides a generally good summary of Cain's problems. I suspect that many of Cain's supporters are similar to Sarah Palin's in some ways. They like Cain as a person and assign an inordinate amount of weight to his likeability. They're not nearly as concerned about electability as they ought to be. They have a tendency to underestimate his weaknesses. They overestimate the role of the media and other sources in harming their candidate. Etc. I was glad when Palin announced she wouldn't be running. Unfortunately, the mindset of her supporters seems to have gained a foothold in the Cain campaign.
Is he guilty of sexual harassment or something similar to it? Probably. I find it unlikely that the growing list of people who have accused him are all wrong. But even if the accusations had never come up, his frequent missteps on the issues, like the examples Hillyer mentions, are enough to disqualify him.
I originally wanted Bobby Jindal to be the Republican candidate. I was also interested in some other possibilities, like Marco Rubio. But my top choices didn't run. So I went with Tim Pawlenty. Remarkably, even candidates as weak as Michelle Bachmann and Herman Cain got more support than Pawlenty did, and he didn't stay in the race long. After Pawlenty, I went with Rick Perry. He's made some mistakes, but his weaknesses aren't nearly as bad as Cain's. Mitt Romney is more electable than Perry, but Perry can be trusted more to govern as a conservative if he gets elected. My sense is that Perry has sufficient electability to win against Barack Obama. But if it doesn't look like he'll be electable enough early next year, I'll move over to Romney. Most Republicans want an alternative to Romney, and they need to decide on one soon. I think Cain should be abandoned, and Perry ought to be the alternative. Then give him some time to improve as a candidate, like improving his debate performances. If he's sufficiently electable early next year, go with Perry. If he's not, go with Romney.