Only if he is the nominee. If he is not, a vote for Cruz or Rubio is the same as a vote for the Democrat. The Democrats will love everyone who votes for the nonnominee.
Ted Cruz already has my vote on record in the Primary. No one who would beat him is anyone I would put my name on. So thankfully Texas is a write in state. Ted Cruz gets my vote nominee or not. If you want to convince someone to vote for someone put someone in there with conservative values. Trump is a “Progressive New York Liberal” always has been. Everyone else is the GOP-e that we have been fighting against. So no... Cruz it is.
The democrats are crossing over to vote for trump themselves has anyone on the trump side wondered why?