Neither the GOPe nor the demoncraps want to see Cruz at the top of the ticket.
He would be a disastrous slam-dunk on Hillary and the GOPe does't want him messing with their plans.
Ya really can't say that about any of the other candidates.
What we really need is a repeat of 1980 - landslide victory and some real pi$$ed off progressives from both parties.
If they could lock Cruz in a separate room they would. When he opens his mouth good sense comes out.