There have been suspicions in the way Cain wouldn’t in the least criticize Romney that he was, like Bachmann, egged (with whatever motivations Romney’s cash-rich campaign might have offered) into the campaign in an effort to dilute the conservative (and possibly the Palin) vote.
Really neither of them has the credentials to run seriously on his or her own.
IMHO, they have the best "credentials", far superior to Romney or Perry.
There is nothing suspicious about that. That is not his MO. Cain is not interested in attacking other Republican candidates, he is going after Obama.
But Cain has brought up Romneycare and will say more if he needs to (I doubt he will).