Yes it appears he had a reason...not necessarily that he thought it through. I think it is sour grapes because Romney just ignored him. Hunter’s reasoning means nothing to me. If he felt so strongly about these things, he should have kept running. I think he is looking for a VP spot.
Hunter spent his whole career in the House, where he was one voice among 435. If he thought he had something to say that was worth listening to he should have found a bigger voice long before now.