right. i believe we have a superior capability. >> the more he stumbles on questions the more doubt it raises about whether he's really ready to be president of the united states. >> reporter: so far cain's support remains strong. in the latest nbc wall street journal poll he's in a statistical tie for the lead for the gop nomination with mitt romney. there were warning signs. republicans still view him favorably but his negative ratings tripled. >> the most important thing to do is over the course of the next 60 days, show that he has a great and steady command of the big issues of the day. >> chuck, the next 60 days will be critical for cain. of course the next week -- >> i was going to say, 56 days. >> even if he gets past the sexual allegations which will consume -- the scandal will consume his campaign. he's going to show a command of