I won't vote for him for VP or President, though. How many more feel like that? Don't know, but I do know that these sorts of threads go on for a lot of posts and the passion about this issue runs very hot. Many have sworn an oath to uphold their understanding of what the Constitution and being Constitutional means.
If you want them to turn on you and work with passion against you, then by all means, run the Cruz/Rubio ticket or vice versa.
Until this issue is decided, as fit and fine as you or I and anyone else may believe them to be for the job, choosing that ticket will be a very divisive within and against those who contribute much of the passionate heart and soul of the party.
Romney didn't inspire them and he lost. What do think pissing them off will do? Why try to find out unless division is what you want? I'm sure there are others who are just as fit and fine for the job and don't bring this division with them.
And those who would fail to vote for Cruz on the basis of him not being a natural born citizen have needlessly succumbed to conspiracy theorists who simply do not have a legal or Constitutional case.