Cruz is going to face the objection that the US Senate does not adequately prepare one to be POTUS. I think this will be especially potent once Obama is done collapsing. Walker as a two-term Governor would be much more able to close the deal on executive experience.
And to slam Hillary for the same.
I've been saying that for a year - not that he's going to "face the objection", I've been actually MAKING the objection.
Three sitting US Senators have been elected President - Harding, JFK, and "Obama". You can throw in HST if you like. I make the case that that's 0 for 3, and that there are reasons for that, including that administration of a political campaign and making a good speech do not constitute qualifications to administer the monstrosity that the Executive Branch has become.
However, if you breathe that around here, better put on your flame suit.