A bright, outspoken black man speaks out against a black president every day. His legitimacy can not be questioned. He cannot be dismissed as most critics of Obama are as "racially motivated". This is very, very scary, troubling, worrisome and annoying to the Democrats and the Washington cabal benefitting every day from the Obama huge government largesse.
Thus, anonymous victims of sexual harassment are dug up to bring this very difficult Republican candidate down.
It's not that Democrats think Herman Cain would ever have a shot at beating Obama. It's that he just Needs. To. Be. Silenced.