The problem is... there’s no one left, since 75% of Republicans want nothing to do with that liberal Romney.
Even if something comes up, who are people gonna turn too? everyone is lacking, so they will just choose the one they like the most, which is Cain.
So even if he comes up lacking too, he will still win.
You really think that if something bad come from Cain vetting people will stick to him because no one is left? What is no one left mean? They can easily leave him and go back to Perry or may be Gingrich the same way some people left Perry and went to other candidates. Have you seen the polls from 2008 primaries? Seriously take a look and let me know where did the person who won the vast majority of the polls from January 30 2007 till January 6 2008 end up? Yes that was Giuliani. How about the 2008 nominee McCain? His campaign was pronounced dead by everyone in the fall of 2007 and up to few days before the first vote was cast in the primaries.
Anyway, time will tell but the important thing is that no one has it in the bag yet not even close.