If they find some crooked way to get Yeb! the nomination, he will lose bigger than McAmnesty.
Well, it worked for the GOPe in 2008 and 2012!
The crookedity is already in operation. The rules for who can be considered at the Convention are a start. RNC people have already said they can mitigate certain primaries developments by judicious (read ham-handed) use of the RNC superdelegates at the convention, And the RNC/Priebus can change the rules at any point they decide things are not working out as they intend. They can, for instance, even without changing the rules, decertify state delegations for various reasons and deny them seats at the Convention.