Let us be perfectly clear, this is more than a guy that lives in the same neighborhood as BO, he threw BO’s first fundraiser back in 1995. If you are at all familiar with politics you know that someone that patronizes your candidacy by hosting a fundrasier does so for a reason. And just as Ayers saw in Barack something he liked and wanted to go out of his way to support so too should Barack have been familiar with this helping hand (just like Rezko).
At best Barack Obama is a terrible judge of character. I think the reality is that he knew exactly who Ayers was and is and that those radical views were not incommensurate with his own. There seems to be too many instances of delayed cognitive dissonance with Barack Obama.