They mean that the left media hasn't unloaded on Cruz... yet. If he's nominated the gloves come off and they'll paint him as a greedy fanatic who combines all the worst qualities of Gordon Gecko and Jerry Falwell.
If it works he goes down like Goldwater.
Agreed, Hillary has a hard time winning when you have to make an argument on why to vote for Hillary, but you provide a boogie man for the other side, then its not a matter of convincing folks to vote for Hillary, its just a matter of painting the other guy as the boogie man.
Cruz is probably the easiest Candidate for the left to paint as the boogieman... like it or not, his actions during the shutdown will easily be used to paint him successfully as such, particularly among the retiree set. The US was literally days from defaulting when the shutdown ended, and don’t think retirees don’t know that... and I don’t care what Shawn Hannity told you, yes, the revenues coming in were NOT enough to make the bond payments due and the other obligations due at the end of the month.
Cruz has the biggest electability issue of the top candidates IMHO. I may agree with him on many policies, but I don’t see him winning a general election. I know I will catch hell for that statement, I always do, but its how I see it.