I'd never vote for a Bush. I think the framing is incorrect for the comparison, though. Think about all of the accusations that Sanders is "insensitive" or whatever to the constituencies that Trump has outright maligned. If Sanders couldn't win the primary, then there'd be no way in hell that Trump could win a Democratic primary with identical rhetoric on those issues.
You'd have to adjust the rhetoric to be of an equivalent, yet left-wing, caliber. Something like:
^^^ And yes, I'd vote for this Donald in a heartbeat, especially over a Bush.