Sure, he should indeed have to answer the same question. And if he refused to answer or indicated he would not vote for you in the general, I would think less of him for it. Darn right he should vote for you if you defeat him and become the nominee. But that doesn't mean you shouldn't answer the question. You have a history of 3rd party activity and no political party is going to embrace you, nor most of its voters, if they believe you aren't part of the team. If your not going to vote for the GOP nominee then your just using their machinery because you know you can't win as an indie. Why would any political party even acknowledge you if they know that is the case?
I don’t have any problem being embraced by the rank and file of the GOP.