Cain is starting to suffer from hoof in mouth disease on a daily basis.
Novice politician. That's the problem with a guy like Cain, he does not have the discipline to avoid saying dumb things - lately on a daily basis. He has not honed the political skills yet to win elections, which is why it would have been better if he had run and won a few races on a local/state level first before shooting for the presidency.
This is why most political analysts don't take him seriously and still regard him as a 2nd tier candidate. Under scrutiny, the odds of Cain holding up are extremely slim.
And yeah, I know people will say they don't want an experienced politician - the problem is, people always say they want a regular citizen but the majority will rarely if ever actually vote that way.