No outsider would be able to do this. You need party backing to do this. Cruz has plenty. They changed the rules when Ron Paul was running to make it difficult for outsiders. But if you're a party person, a card carrying member of the Uniparty, well, doors magically open for you and you can steal anything you want. It is "their" party after all. Now it's obvious to everyone they don't even have to pretend to care about the voters in presidential elections anymore.
See how much I care about "their" party in local elections from now on.
Never Cruz.