I think the only defense they will attempt is to claim that he reasonably relied on his lawyers to explore the available options, which included illegal schemes... with that they can at least try to spread some of the blame to his counsel. It will be a very hard sell to the jurors, but one of them might end up agreeing that he was too stupid to think of any of those options and wouldn't have been able to crime much on his own. Still, the judge will remind them that they must take the facts and evidence into account, and with that it becomes too difficult to not find him guilty. He was literally out there strong arming his lawyers, aides, and state election officials to help him break laws. He really doesn't have cover here.